How Quantum is Quantum Counterfactual Communication?

Hance, Jonte R.; Ladyman, James; Rarity, John

doi:10.1007/s10701-021-00412-5

Cited by 23 publications

(17 citation statements)

References 72 publications

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“…This, however, is only a feature of the one-outer-cycle form of counterfactual communication we give here when two or more outer cycles are used instead, the error probability in the protocol is 0, and therefore doesn't depend on the bit sent (see the Appendix of ref. 24 for more discussion on unequal bit error rates in counterfactual communication).…”

Section: Discussionmentioning

confidence: 99%

The laws of physics do not prohibit counterfactual communication

et al. 2022

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It has been conjectured that counterfactual communication is impossible, even for post-selected quantum particles. We strongly challenge this by proposing precisely such a counterfactual scheme where—unambiguously—none of Alice’s photons that correctly contribute to her information about Bob’s message have been to Bob. We demonstrate counterfactuality experimentally by means of weak measurements, and conceptually using consistent histories—thus simultaneously satisfying both criteria without loopholes. Importantly, the fidelity of Alice learning Bob’s bit can be made arbitrarily close to unity.

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Section: Discussionmentioning

confidence: 99%

The laws of physics do not prohibit counterfactual communication

et al. 2022

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“…The same logic also applies to Salih et al ’s counterfactual communication device and related protocols [44–46], and so protocols for imaging [47] and for quantum information transfer derived from it [48,49].…”

Section: Using the ψ-Ensemble To Make Sense Of Quantum Experimentsmentioning

confidence: 99%

The wave function as a true ensemble

Hance

Hossenfelder²

2022

Proc. R. Soc. A.

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In quantum mechanics, the wave function predicts probabilities of possible measurement outcomes, but not which individual outcome is realized 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.

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“…However, when the carriers are quantum particles, we do not have a clear definition of their location, so the definition of quantum counterfactual communication is ambiguous. There is already a vast literature addressing the controversy surrounding counterfactual communication [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. In this paper we analyze recent arguments by Arvidsson-Shukur and Barnes [28], henceforth A-SB, according to which postselection should not be allowed in genuine quantum counterfactual communication.…”

Section: Introductionmentioning

confidence: 99%

Three approaches for analyzing the counterfactuality of counterfactual protocols

Wander,

Cohen,

Vaidman

2021

Preprint

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Counterfactual communication protocols are analysed using three approaches: a classical argument, the weak trace criterion, and the Fisher information criterion. It is argued that the classical analysis leads to contradiction and should therefore be abandoned. The weak trace and Fisher information criteria are shown to agree about the degree of counterfactuality of communication protocols involving postselection. It is argued that postselection is a necessary ingredient of counterfactual communication protocols. Coherent interaction experiments, as well as a recently introduced modification of counterfactual communication setups which eliminates the weak trace, are discussed.

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How Quantum is Quantum Counterfactual Communication?

Cited by 23 publications

References 72 publications

The laws of physics do not prohibit counterfactual communication

The laws of physics do not prohibit counterfactual communication

The wave function as a true ensemble

Three approaches for analyzing the counterfactuality of counterfactual protocols

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