Delayed-choice experiments in quantum mechanics are often taken to undermine a realistic interpretation of the quantum state. More specifically, Healey has recently argued that the phenomenon of delayed-choice entanglement swapping is incompatible with the view that entanglement is a physical relation between quantum systems. This paper argues against these claims. It first reviews two paradigmatic delayed-choice experiments and analyzes their metaphysical implications. It then applies the results of this analysis to the case (...) of entanglement swapping, showing that such experiments pose no threat to realism about entanglement. (shrink)

There is a fallacy that is often involved in the interpretation of quantum experiments involving a certain type of separation such as the: double-slit experiments, which-way interferometer experiments, polarization analyzer experiments, Stern-Gerlach experiments, and quantum eraser experiments. The fallacy leads not only to flawed textbook accounts of these experiments but to flawed inferences about retrocausality in the context of delayed choice versions of separation experiments.

Delayed-choice experiments in quantum mechanics are often taken to undermine a realistic interpretation of the quantum state. More specifically, Healey has recently argued that the phenomenon of delayed-choice entanglement swapping is incompatible with the view that entanglement is a physical relation between quantum systems. This paper argues against these claims. It first reviews two paradigmatic delayed-choice experiments and analyzes their metaphysical implications. It then applies the results of this analysis to the case (...) of entanglement swapping, showing that such experiments pose no threat to realism about entanglement. (shrink)

The concept of retroactive apparent occurrence, the main ingredient of Wheeler's delayed-choice thought experiments, is systematically incorporated into the quantum theory of measurement (in the framework of the recent review of Busch, Lahti, and Mittelstaedt). Besides, the (general) notion of individual-system measurement is introduced, and, due to it, premeasurement is defined by a truly minimal condition. Finally, retroactive apparent occurrence is made use of to derive apparent objectification in measurement. The derivation is discussed in the framework of (...) the quantum mechanical approach to the objectification problem. (shrink)

It is pointed out that a slight variation on the Wheeler Delayed Choice Experiment presents the same challenge to orthodox quantum mechanics as Maudlin-type contingent absorber experiments present to the Transactional Interpretation. Therefore, the latter cannot be used as a basis for refutation of TI.

We treat here three apparently uncorrelated topics from the point of view of dense measurement: The EPR paradox, the teleportation process, and Wheeler's delayed-choice experiment (DCE). We begin with the DCE and show, using its unique nature and the histories formalism, that use may ascertain and fix the notion of dense measurement (the Zeno effect). We show here by including the experimenter (observer) as an inherent part of the physical system and using the Aharonov–Vardi notion of dense measurement (...) along a path, that knowledge of certain properties of the incoming system (after a measurement) is equivalent to dense measurement. We reach the same conclusion by discussing the teleportation process, and the EPR paradox from, the same point of view. (shrink)

The prominent characteristic of a delayed-choice effect is to make the choice between complementary types of phenomena after the relevant interaction between the system and measuring instrument has already come to an end. In this paper, we first represent a detailed comparative analysis of some early delayed-choice propositions and also most of the experimentally performed delayed-choice proposals in a coherent and unified quantum mechanical formulation. Taking into the account the represented quantum mechanical descriptions (...) and also the rules of probability theory, we discuss that there are two fundamentally different descriptions concerning the physical mechanism of the delayed-choice between the complementary types of phenomena in these experiments. In this regard, we finally conclude that the delayed-choice experiments can be classified into two main groups where the temporal aspect of each group is characterized differently within their probabilistic descriptions. (shrink)

This paper explains the delayed choice quantum eraser of Kim et al. in terms of the transactional interpretation of quantum mechanics by Cramer. It is kept deliberately mathematically simple to help explain the transactional technique. The emphasis is on a clear understanding of how the instantaneous “collapse” of the wave function due to a measurement at a specific time and place may be reinterpreted as a relativistically well-defined collapse over the entire path of the photon and over the (...) entire transit time from slit to detector. This is made possible by the use of a retarded offer wave, which is thought to travel from the slits to the detector and an advanced counter wave traveling backward in time from the detector to the slits. The point here is to make clear how simple the transactional picture is and how much more intuitive the collapse of the wave function becomes if viewed in this way. Also, any confusion about possible retro-causal signaling is put to rest. A delayed choice quantum eraser does not require any sort of backward in time communication. This paper makes the point that it is preferable to use the TI over the usual Copenhagen interpretation for a more intuitive understanding of the quantum eraser delayed choice experiment. Both methods give exactly the same end results and can be used interchangeably. (shrink)

Delayed-choice erasure is investigated in two-photon two-slit experiments that are generalizations of the micromaser experiment of Scully et al. (Nature 351:111–116, 1991). Applying quantum mechanics to the localization detector, it is shown that erasure with delayed choice in the sense of Scully, has an analogous structure as simple erasure. The description goes beyond probabilities. The EPR-type disentanglement, consisting in two mutually incompatible distant measurements, is used as a general framework in both parts of this study. (...) Two simple coherence cases are shown to emerge naturally, and they are precisely the two experiments of Scully et al. The treatment seems to require the relative-reality-of-unitarily-evolving-state (RRUES) approach. Besides insight in the experiments, this study has also the goal of insight in quantum mechanics. The question is if the latter can be more than just a “book-keeping device” for calculating probabilities as Scully et al. modestly and cautiously claim. (shrink)

It was pointed out in the first part of this study (Herbut in Found. Phys. 38:1046–1064, 2008) that EPR-type entanglement is defined by the possibility of performing any of two mutually incompatible distant, i.e., direct-interaction-free, measurements. They go together under the term ‘EPR-type disentanglement’. In this second part, quantum-mechanical insight is gained in the real random delayed-choice erasure experiment of Kim et al. (Phys. Rev. Lett. 84:1–5, 2000) by a relative-reality-of-unitarily-evolving-state (RRUES) approach (explained in the first part). Finally, (...) it is shown that this remarkable experiment, which performs, by random choice, two incompatible measurements at the same time, is actually an EPR-type disentanglement experiment, closely related to the micromaser experiment discussed in the first part. (shrink)

It is demonstrated that ‘quantum eraser’ experiments do not erase any information. Nor do they demonstrate ‘temporal nonlocality’ in their ‘delayed choice’ form, beyond standard EPR correlations. It is shown that the erroneous erasure claims arise from assuming that the improper mixed state of the signal photon physically prefers either the ‘which way’ or ‘both ways’ basis, when no such preference is warranted. The latter point is illustrated through comparison of the QE spatial state space with the (...) spin-1/2 space of particles in the EPR-spin experiment. (shrink)

Experiments involving delayed-choice entanglement swapping seem to suggest that particles can become entangled after they’ve already been detected. This astonishing result is taken by some to undermine realism about entanglement. In this paper, I argue that one can offer a fully realist explanation of delayed-choice entanglement swapping by countenancing timelike entanglement relations. I argue that such an explanation—radical though it may be—isn’t incoherent and doesn’t invite paradox. I compare this approach to the antirealist alternative and (...) a more deflationary realist strategy defended by Egg, each of which face certain challenges. The upshot is that we should take seriously the possibility of timelike entanglement and seek to develop a framework for quantum theory which allows for it. (shrink)

In this original work, Steven DeLay, using a wide breadth of philosophical sources, articulates a view of selfhood which emphasizes humanity’s ineluctable experience before-God.

In this essay, I argue that genuine responsibility and ethical self-understanding are possible without narrative—or, at least, that narrative is not always sufficient. In §2, I introduce and clarify a distinction between our ontological subjectivity and everyday practical identity—one made famous by Heidegger and Sartre. On the basis of this distinction, in §3 I argue that narrative is unable to ground ethical choice and decision. For, although acting in light of practical identities is something we do, it cannot wholly (...) capture what it is to be who we are. Irrespective of whatever worldly projects and identities we press into, something about our subjectivity always remains unchanged. Narrative identity, which trades merely on practical identity, thus obscures this ontological dimension of life wherein human action, decision, choice, and responsibility truly originate. By way of conclusion, in §4, I briefly examine depictions of the narrative life found within the authorships of Dostoevsky, Kierkegaard, and Voltaire, illustrating how self-narrative at times invites self-deception and annuls responsibility. A life of genuine responsibility demands more than what the most candid and best intentioned of self-narratives can supply us. Living the good life, I shall intimate, is thus not something that involves mere narrative. It depends, rather, on inwardness. (shrink)

This essay addresses the questions of whether the givenness of God is something possible, intelligible—and, if so, what such givenness might involve. In the interest of situating these questions in historical context, I first summarize Kant’s, Hegel’s, and Habermas’s respective accounts of the relationship between belief in God and philosophical knowledge. I then further situate critical philosophy’s appropriation of God by way of a discussion of how some of this appropriation’s fiercest critics—existentialists such as Sartre, Shestov, and Kierkegaard—object to its (...) gambit of using God to serve moral and cultural goals even as it denies God’s actual existence. Though this objection is a salient one, it leaves something to be desired. For although the existentialists may demonstrate what is misguided about the philosophers’ God, they do not have anything especially compelling to say about whether or how God can be given experientially. I address this aporia by exploiting what I take to be a happy intersection between the phenomenological conception of the saturated phenomenon and two moods—agape love and ecstatic joy—the mystical tradition frequently attributes to the nature of divine givenness. I argue that, when mystical experience is situated within the framework of saturated phenomena rather than within the Kantian enclosures of phenomenality, two intriguing possibilities emerge. First, it seems plausible that the religious experience of the mystic can, in principle, involve the very givenness of God that Kant and his heirs denied to be possible. Second, though phenomenology has yet to provide a complete positive portrait of the religious life, the mystical tradition emerges as a legitimate, invaluable source with which such a phenomenological portrait might begin. (shrink)

A modified version of Young's experiment by Shahriar Afshar demonstrates that, prior to what appears to be a ``which-way'' measurement, an interference pattern exists. Afshar has claimed that this result constitutes a violation of the Principle of Complementarity. This paper discusses the implications of this experiment and considers how Cramer's Transactional Interpretation easily accomodates the result. It is also shown that the Afshar experiment is isomorphic in key respects to a spin one-half particle prepared as ``spin up along x'' and (...) post-selected in a specific state of spin along z. The terminology ``which way'' or ``which-slit'' is critiqued; it is argued that this usage by both Afshar and his critics is misleading and has contributed to confusion surrounding the interpretation of the experiment. Nevertheless, it is concluded that Bohr would have had no more problem accounting for the Afshar result than he would in accounting for the aforementioned pre- and post-selection spin experiment, in which the particle's preparation state is confirmed by a nondestructive measurement prior to post-selection. In addition, some new inferences about the interpretation of delayed choice experiments are drawn from the analysis. (shrink)

A modified version of Young's experiment by Shahriar Afshar demonstrates that, prior to what appears to be a ``which-way'' measurement, an interference pattern exists. Afshar has claimed that this result constitutes a violation of the Principle of Complementarity. This paper discusses the implications of this experiment and considers how Cramer's Transactional Interpretation easily accomodates the result. It is also shown that the Afshar experiment is isomorphic in key respects to a spin one-half particle prepared as ``spin up along x'' and (...) post-selected in a specific state of spin along z. The terminology ``which way'' or ``which-slit'' is critiqued; it is argued that this usage by both Afshar and his critics is misleading and has contributed to confusion surrounding the interpretation of the experiment. Nevertheless, it is concluded that Bohr would have had no more problem accounting for the Afshar result than he would in accounting for the aforementioned pre- and post-selection spin experiment, in which the particle's preparation state is confirmed by a nondestructive measurement prior to post-selection. In addition, some new inferences about the interpretation of delayed choice experiments are drawn from the analysis. (shrink)

Previous research has shown that subliminally presented stimuli accelerate or delay responses afforded by supraliminally presented stimuli. Our experiments extend these findings by showing that unconscious stimuli even affect free choices between responses. Thus, actions that are phenomenally experienced as freely chosen are influenced without the actor becoming aware of the manipulation. However, the unconscious influence is limited to a response bias, as participants chose the primed response only in up to 60% of the trials. LRP data in free (...) choice trials indicate that the prime was not ineffective in trials in which participants chose the non-primed response as then it delayed performance of the incongruently primed response. (shrink)

We present an experiment in which we add a common delay in a choice between two risky prospects. The results show that delay produces the same change in preferences as in the well-documented common ratio effect in risky lotteries. The added common delay acts as if the probabilities were divided by some common ratio. Moreover, we show that there is a strong magnitude effect, in the sense that the effect of delay depends on the magnitude of the outcome. The (...) results are consistent with the recently introduced probability time trade-off (PTT) model by Baucells and Heukamp. We present a parameterization of the model based on the experimental results, showing that the value function exhibits increasing relative risk aversion, the weighting function is s-shaped, and the intrinsic discount rate is decreasing. (shrink)

We describe a new class of experiments designed to probe the foundations of quantum mechanics. Using quantum controlling devices, we show how to attain a freedom in temporal ordering of the control and detection of various phenomena. We consider wave–particle duality in the context of quantum-controlled and the entanglement-assisted delayed-choice experiments. Then we discuss a quantum-controlled CHSH experiment and measurement of photon’s transversal position and momentum in a single set-up.

When making a decision, humans consider two types of information: information they have acquired through their prior experience of the world, and further information they gather to support the decision in question. Here, we present evidence that data from search engines such as Google can help us model both sources of information. We show that statistics from search engines on the frequency of content on the Internet can help us estimate the statistical structure of prior experience; and, specifically, we outline (...) how such statistics can inform psychological theories concerning the valuation of human lives, or choices involving delayed outcomes. Turning to information gathering, we show that search query data might help measure human information gathering, and it may predict subsequent decisions. Such data enable us to compare information gathered across nations, where analyses suggest, for example, a greater focus on the future in countries with a higher per capita GDP. We conclude that search engine data constitute a valuable new resource for cognitive scientists, offering a fascinating new tool for understanding the human decision-making process. (shrink)

Bohmian mechanics, a hydrodynamic formulation of the quantum theory, constitutes a useful tool to understand the role of the phase as the mechanism responsible for the dynamical evolution displayed by quantum systems. This role is analyzed and discussed here in the context of quantum interference, considering to this end two well-known scenarios, namely Young’s two-slit experiment and Wheeler’s delayed choice experiment. A numerical implementation of the first scenario is used to show how interference in a coherent superposition of (...) two counter-propagating wave packets can be seen and explained in terms of an effective model consisting of a single wave packet scattered off an attractive hard wall. The outcomes from this model are then applied to the analysis of Wheeler’s delayed choice experiment, also recreated by means of a reliable realistic simulation. Both examples illustrate quite well how the Bohmian formulation helps to explain in a natural way aspects of the quantum theory typically regarded as paradoxical. In other words, they show that a proper understanding of quantum phase dynamics immediately removes any trace of unnecessary artificial wave-particle arguments. (shrink)

Before going further, it will be helpful to consider briefly the notion that novelty per se is a fundamental human need. Experiments with human beings, as well as with animals, indicate that the maintenance of normal, successful behavior depends upon an adequate level of incoming stimulation—or, as some have put it, of novelty.2 But lumping all novelty together is misleading. At least three kinds of novelty need to be distinguished. Some novel patterns arise out of, or represent, changes in (...) the fundamental rules governing the organization of musical processes and structures. By significantly weakening our comprehension of the musical relationships presented—undermining not only our understanding of what is past but our ability to envisage what is to come—such systemic change seriously threatens our sense of psychic security and competent control. Far from being welcome, the insecurity and uncertainty thus engendered is at least as antipathetic, disturbing, and unpleasant as stimulus privation. Novel patterns may also result from the invention of a new strategy that accords with prevalent stylistic rules. Though they may initially seem to threaten existing competencies, the function and significance of novel strategies within the larger set of stylistic constraints can usually be grasped without too much delay or difficulty. For a while the tensions produced by strategic innovation may seem disturbing. But in the end, when our grasp of the principles ordering events is confirmed and our sense of competency is reestablished and control is reinforced, tension is resolved into an elation that is both stimulating and enjoyable. Most novel patterns—original themes, rhythms, harmonic progressions, and so forth—involve the innovative instantiation or realization of an existing strategy or schema .3 Novelties of this kind not only enhance our sense of control—a feeling that we know how things really “work”—but provide both the pleasure of recognition and the joy of skillfully exercising some competency. We enjoy novelty—the stimulation of surprise, the tension of uncertainty—as long as it can be accommodated within a known and understandable set of constraints. When the rules governing the game are abrogated or in doubt—when comprehension and control are threatened—the result is usually anger, anguish, and desperation.These responses to novelty are consequences of fundamental and poignant verities of the human condition: the centrality of choice in human behavior. Because only a minute fraction of human behavior seems to be genetically specified, choice is inescapable.While in lower organisms, behavior is strictly determined by the genetic program, in complex metazoa the genetic program becomes less constraining, more “open” as Ernst Mayr puts it, in the sense that it does not lay down behavioral instructions in great detail but rather permits some choice and allows for a certain freedom of response. Instead of imposing rigid prescriptions, it provides the organism with potentialities and capacities. This openness of the genetic program increases with evolution and culminates in mankind.4The price of freedom is the imperative of choice. Human beings must choose were to sow and when to reap, when to work and where to live, when to play and what to build. Intelligent, successful choices are possible only if alternative courses of action can be imagined and their consequences envisaged with reasonable accuracy. 2. For further discussion, see my Music, the Arts, and Ideas , p. 50.3. Rules are transpersonal but intracultural constraints—for instance, the pitch/time entities established in some style, as well as grammatical and syntactic regularities. Strategies are general means for actualizing some of the possibilities that are potential in the rules of the style. The rules of a style are relatively few, while the number of possible strategies may, depending upon the nature of the rules, be very large indeed. The ways of instantiating a particular strategy are, if not infinite, at least beyond reckoning.4. François Jacob, The Possible and the Actual , p. 61. See also Stephen Jay Gould, Ever Since Darwin , p. 257. (shrink)

Most recent writing linking science and literature has concerned itself with challenges to the epistemological status of scientific knowledge in an attempt to demonstrate its contingency, arguing in the more radical efforts that the structures of science are no more than useful fictions. This essay also includes an epistemological comparison between science and literature, but instead of making grand or meta–statements about the nature of knowing generally in the two fields, mine is a much narrower aim. My exploration entails two (...) tasks. First, I provide a close–up look at a particular type of experiment, called the delayed–choice experiment, which clearly reveals the strangeness of the quantum world. In connection with this experiment, I discuss wave functions—mathematical expressions used by physicists to describe quantum behavior and predict the outcome of experiments involving quanta. Second, I look at Walt Whitman's “Song of Myself” focusing on the meaning of the “self” in the poem. My aim is to treat the object of study in each field as a “text” and to assert and demonstrate a parallel in the strategies of thought and response between physicists (“readers”) pondering the meaning and status of a wave function and poem readers pondering the meaning and status of the poem's self. In Whitman's “Song” we find an attempt to understand complex aspects of human experience that are said to transcend ordinary reality, an effort for which I believe there are parallels in the attempts of modern physicists to understand complex, nonintuitive aspects of the subatomic world. While not making the kind of broad claims eschewed above, I do suggest that this focused study has interesting implications since both the wave function and the poem's self force their respective sets of “readers” to confront questions of ultimacy—to consider, that is, epistemological and ontological issues of more than passing interest to students of science as well as those of metaphysics and theology. (shrink)

Intertemporal choice requires one to decide between smaller sooner and larger later payoffs and is captured by discount rates. Across two preregistered experiments testing three language pairs (Polish vs. English, Spanish, and German; Experiment 1) and with incentivized participants (Experiment 2), we found no evidence that using a foreign language decreased the strength or increased the consistency of intertemporal choices. On the contrary, there was some evidence of stronger discounting when a foreign language was used. We confirmed prior (...) findings that more reflective individuals discount less strongly but observed that they were just as (un)affected by using foreign language as less reflective individuals. Thus, we provide preliminary evidence that the foreign language effect is robust to individual differences in cognitive reflection. (shrink)

Intertemporal choice requires one to decide between smaller sooner and larger later payoffs and is captured by discount rates. Across two preregistered experiments testing three language pairs (Polish vs. English, Spanish, and German; Experiment 1) and with incentivized participants (Experiment 2), we found no evidence that using a foreign language decreased the strength or increased the consistency of intertemporal choices. On the contrary, there was some evidence of stronger discounting when a foreign language was used. We confirmed prior (...) findings that more reflective individuals discount less strongly but observed that they were just as (un)affected by using foreign language as less reflective individuals. Thus, we provide preliminary evidence that the foreign language effect is robust to individual differences in cognitive reflection. (shrink)

We report on five experiments investigating response choices and response times to simple science questions that evoke student “misconceptions,” and we construct a simple model to explain the patterns of response choices. Physics students were asked to compare a physical quantity represented by the slope, such as speed, on simple physics graphs. We found that response times of incorrect answers, resulting from comparing heights, were faster than response times of correct answers comparing slopes. This result alone might be explained (...) by the fact that height was typically processed faster than slope for this kind of task, which we confirmed in a separate experiment. However, we hypothesize that the difference in response time is an indicator of the cause of the response choice. To support this, we found that imposing a 3-s delay in responding increased the number of students comparing slopes on the task. Additionally a significant proportion of students recognized the correct written rule , but on the graph task they incorrectly compared heights. Finally, training either with repetitive examples or providing a general rule both improved scores, but only repetitive examples had a large effect on response times, thus providing evidence of dual paths or processes to a solution. Considering models of heuristics, information accumulation models, and models relevant to the Stroop effect, we construct a simple relative processing time model that could be viewed as a kind of fluency heuristic. The results suggest that misconception-like patterns of answers to some science questions commonly found on tests may be explained in part by automatic processes that involve the relative processing time of considered dimensions and a priority to answer quickly. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:The Infertility Treadmill: Feminist Ethics, Personal Choice, and the Use of Reproductive Technologies by Karey HarwoodKathryn Lilla CoxThe Infertility Treadmill: Feminist Ethics, Personal Choice, and the Use of Reproductive Technologies Karey Harwood Chapel Hill, NC: University of North Carolina Press, 2007. 221pp. $22.00Karey Harwood’s The Infertility Treadmill, published in the University of North Carolina’s Studies in Social Medicine series, fills a lacuna in the infertility literature. (...) Harwood takes an interdisciplinary approach examining “assisted reproductive technologies” (ART) using current scientific, philosophical, theological, and—most importantly—her own ethnographic research. By way of a thick description of women’s experiences of infertility, she draws the reader into a rich ethical conversation regarding ARTs.Harwood “seeks first and foremost to offer an interpretation of the ethical significance of the increasing use of ART by bringing a particular set of normative or evaluative lenses to bear on a particular set of descriptive data” (8). She engaged in this study because of her desire to explore the connections between decisions to use ART and such factors as paid employment, delayed childbirth, and the ongoing balancing of work and family life. Harwood gathered her descriptive data by spending a year with the Atlanta chapter of RESOLVE (The National Infertility Association): attending monthly meetings and listening to speakers and participants as well as appraising RESOLVE’s national and local literature. She also conducted nine interviews with eight women and one man. Focusing on work and family conflicts in light of questions related to gender justice and the interplay between social and communal norms theories, on the one hand, and private and individual choice, on the other, Harwood teases out the ethical complexity surrounding ARTs.After surveying philosophical and theological literature relevant to her topic, Harwood names and examines existential concerns that emerged from her observations, conversations, and interviews with RESOLVE members. Clustered thematically, these concerns include the painful isolation of infertility, the stigma attached to using ARTs, people’s moralizing, how much treatment to pursue, what is the value in trying one more thing, socioeconomic status, and emotional awareness (62–97). Throughout her discussion of these concerns, [End Page 209] Harwood reminds ethicists of the importance of personal narratives for any treatment of an ethical issue like this.Moreover, her research leads Harwood to deduce that RESOLVE helps people with meaning-making, questions of purpose, language clarification, and various options surrounding infertility and ARTs. She asserts that the infertility experience can be a transformative one for the infertile. The decision-making process regarding the use of ARTs functioned as a type of ritual—albeit “a consumeristic ritual”—that aided people in working through the grief of infertility (157). Religious institutions have not always helped the infertile in these areas. Nonetheless, Harwood’s study leads her to conclude that RESOLVE members and leaders tend to be deficient in their capacities for challenging and critically examining how individual decisions intertwine with larger social contexts.Harwood acknowledges that her methodological decision to focus on one RESOLVE chapter limited her demographics (63–64). Moreover, although for the most part balanced, Harwood’s assessment of her findings is at times partial, even bordering on advocacy. For example, she clearly seeks to make the case that ethical analyses of infertility need to be more nuanced—incorporating more personal narrative—and that RESOLVE needs to be more open to critical self-reflection, especially the critical questioning of the “treadmill of infertility” (133). In her analysis of her findings, Harwood demonstrates how personal narratives help nuance ethical analysis. Less clear is whether RESOLVE can be or wants to be more self-critical and more questioning of its own core premises. Nonetheless, these limitations do not detract from Harwood’s important insights regarding “the infertility treadmill” and the host of issues related to ARTs—including consumerism, the role of rituals, meaning-making, suffering and grief, and gender justice, among others.Those struggling with infertility or considering ARTs will find Harwood to be an empathetic dialogue partner. Others will gain a deeper understanding of infertility’s toll by reading this book. Graduate and advanced undergraduate students will benefit from Harwood’s analysis of how personal decisions have wide-ranging... (shrink)

Choice experiment (CE) is a questionnaire based method that the accuracy of research questionnaire determines the validity of the research outcomes. Attribute selection has a prime importance in every CE studies. If respondents do not understand or do not have preference for a certain attribute, the attribute non-attendance problem might happen that biases overall results of the research. Qualitative approaches such as literature review, focus group discussion, and in depth discussion commonly applied in CE researches. However, especially in the (...) developing countries context where ethnical and cultural diversity is a challenge in conducting survey based questionnaires, qualitative methods are not sufficient in selecting attributes. Present study investigates the application of relative importance index (RII) in respondents¡¯ preference for attributes in a modal shift study in Klang Valley, Malaysia. The 5 point Likert scale questions were employed to enhance respondents¡¯ preferences for initial 24 selected attributes. The results of this study showed that from 24 pre-selected attributes, only 18 of them had RII>0.5 and could be included in the final CE design. The results of this study could help researchers to control for unobserved problems in selecting the attributes which could not be discovered through qualitative approaches. -/- . (shrink)

Building on Peres’ idea of “Delayed-choice for entanglement swapping” we show that even the degree to which quantum systems were entangled can be defined after they have been registered and may even not exist any more. This does not arise as a paradox if the quantum state is viewed as just a representative of information. Moreover such a view gives a natural quantification of the complementarity between the measure of information about the input state for teleportation and the (...) amount of entanglement of the resulting swapped entangled state. (shrink)

Discrete choice experiments (DCE) are often used to elicit preferences, for instance, in health preference research. However, DCEs only provide binary responses, whilst real-life choices are made with varying degrees of conviction. We aimed to verify whether eliciting self-reported convictions on a 0–100 scale adds meaningful information to the binary choice. Eighty three respondents stated their preferences for health states using DCE and the time trade-off method (TTO). In TTO, utility ranges were also elicited to account for (...) preference imprecision. We verified the properties of the conviction across three areas: (1) response to various choice task modifications (e.g. dominance, increase in complexity, distance from the status quo) and association with rationality violations (e.g. intransitivity); (2) association with test–retest results; (3) relation to the utility difference and imprecision estimated in TTO. Regarding (1), conviction increased in choice tasks with lower complexity, larger relative attractiveness, and lower distance to the status quo. Regarding (2), choices made with above-median conviction were sustained in 90% of the cases, compared to 68% for below-median conviction. Regarding (3), the conviction increases with utility difference and it decreases with utility imprecision; overconfidence seems to prevail: non-zero conviction is reported even for identical utilities. Self-reported conviction in DCE is associated in an intuitive way with the observed choices. It may, therefore, be useful in explaining or predicting behaviour or bridging the gap between the results of various elicitation tasks. (shrink)

In quantum mechanics, the wavefunction predicts probabilities of possible measurement outcomes, but not which individual outcome is realised in each run of an experiment. This suggests that it describes an ensemble of states with different values of a hidden variable. Here, we analyse this idea with reference to currently known theorems and experiments. We argue that the ψ-ontic/epistemic distinction fails to properly identify ensemble interpretations and propose a more useful definition. We then show that all local ψ-ensemble interpretations which (...) reproduce quantum mechanics violate Statistical Independence. Theories with this property are commonly referred to as superdeterministic or retrocausal. Finally, we explain how this interpretation helps make sense of some otherwise puzzling phenomena in quantum mechanics, such as the delayed choice experiment, the Elitzur-Vaidman bomb detector, and the Extended Wigner's Friends Scenario. (shrink)

Sometimes it is possible in quantum theory for a system to interact with another system in such a way that the information contained in the wave function becomes very scrambled and apparently incoherent. We produce an example which is exactly calculable, in which a macroscopic change is induced in the environment, and all phase information for the system is apparently lost, so that a measurement has seemingly been made. But actually, although the wave function has been badly scrambled, all the (...) original information is still present. We call this situation one of “latent order.”Subsequently, the system interacts again with the environment, wiping out the macroscopic change, and the wave function once again becomes manifestly coherent. Thus the apparent measurement has been undone, and leaves no aftereffect. Thus, our “measurement” has disappeared without a trace. We call such a measurement a “haunted measurement,” and we believe that until the measurement process is rigorously understood, the concept of measurement is ambiguous. It is just not good enough to say that an amplification stage occurs “somewhere” in the process.We also point out the connection between the haunted measurement and delayed-choice experiments and discuss a haunted version of the “Schrödinger's Cat” experiment and of the Einstein-Podolsky-Rosen experiment. (shrink)

In a recent paper (Zwirn in Phys Essays 30: 3, 2017), I argued against backward in time effects used by several authors to explain delayed choice experiments. I gave an explanation showing that there is no physical influence propagating from the present to the past and modifying the state of the system at a time previous to the measurement. However, though the solution is straightforward in the case of delayed choice experiments involving only one (...) particle, it is subtler in the case of experiments involving two entangled particles because they give rise to EPR-like situations. Considering that a measurement is not an actual change of the physical state of a system and is relative to the observer allows to understand that there is neither backward in time effects nor instantaneous collapse of the second system when the first one is measured, as is often postulated. This allows also to get rid of any non-locality (Zwirn in Found Phys 50:1–26, 2020). In this paper, I want to go further into the consequences of this way of considering the measurement, that I have called Convivial Solipsism, and show that even if, in the usual sense, there is no physical effect of the present or of the future on the past, we must nevertheless consider that the observer’s past is sometimes not entirely determined and that it becomes determined only when certain measurements are done latter. This apparent contradiction disappears if one understand that each observer builds, through her own measurements, her own world (that I call the phenomenal world in Convivial Solipsism) which is different from what we are used to consider as the common world shared by everybody. (shrink)

Recently, Bohr’s complementarity principle was assessed in setups involving delayed choices. These works argued in favor of a reformulation of the aforementioned principle so as to account for situations in which a quantum system would simultaneously behave as wave and particle. Here we defend a framework that, supported by well-known experimental results and consistent with the decoherence paradigm, allows us to interpret complementarity in terms of correlations between the system and an informer. Our proposal offers formal definition and operational (...) interpretation for the dual behavior in terms of both nonlocal resources and the couple work-information. Most importantly, our results provide a generalized information-based trade-off for the wave–particle duality and a causal interpretation for delayed-choice experiments. (shrink)

Bell's theorem is expounded as an analysis in Bayesian inference. Assuming the result of a spin measurement on a particle is governed by a causal variable internal (hidden, “local”) to the particle, one learns about it by making a spin measurement; thence about the internal variable of a second particle correlated with the first; and from there predicts the probabilistic result of spin measurements on the second particle. Such predictions are violated by experiment: locality/causality fails. The statistical nature of the (...) observations rules out signalling; acausal, superluminal, or otherwise. Quantum mechanics is irrelevant to this reasoning, although its correct predictions of experiment imply that it has a nonlocal/acausal interpretation. Cramer's newtransactional interpretation, which incorporates this feature by adapting the Wheeler-Feynman idea of advanced and retarded processes to the quantum laws, is advocated. It leads to an invaluable way of envisaging quantum processes. The usual paradoxes melt before this, and one, the “delayed choice” experiment, is chosen for detailed inspection. Nonlocality implies practical difficulties in influencing hidden variables, which provides a very plausible explanation for why they have not yet been found; from this standpoint, Bell's theoremreinforces arguments in favor of hidden variables. (shrink)

A class of retrospective measurements analogous to the “delayed choice experiments” of Wheeler and Greenberger is considered. A new argument shows that the reduction of the wave packet must affect the past states of the system. As a side product, our argument implies that the axiom about the reduction of the wave packet in relativistic space-time cannot be consistently introduced.

In the present paper we expand upon ideas published some time ago in connection with which path detectors based on the micromaser. Frequently questions arise concerning the time ordering of detection and eraser events. We here show, by a detailed and careful analysis of a quantum eraser experimental setup, that the experimenter can choose to ascertain particle-like which path information or wavelike interference information even after the atom has hit the screen.

Zusammenfassung Das Ziel der vorliegenden Untersuchung ist es, die Präferenzen deutscher Bürger für die sportlichen Erfolge ihrer einheimischen Athleten und Mannschaften bei Olympischen Sommerspielen zu ermitteln. Hierzu wurde im Juli 2015 mit 159 Personen ein Discrete-Choice-Experiment durchgeführt. In 14 Entscheidungsszenarien standen jeweils zwei Alternativen des Konsums deutschen olympischen Sporterfolges zur Auswahl, die sich in folgenden vier Attributen unterschieden: Sportart, Gesamterfolg, Modus des Konsums und Zahlungsvehikel. Die multivariate Analyse ergab einen signifikanten Einfluss aller vier Attribute auf die Wahlentscheidung. U. a. (...) würden die Befragten 1,26 € im Monat spenden, um olympische Erfolge live im Fernsehen oder Internet miterleben zu können. (shrink)