Counterfactuality of “counterfactual” communication

Vaidman, Lev

doi:10.1364/laop.2014.lm3b.1

Cited by 14 publications

(20 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The claim that it achieves counterfactual communication was challenged by Vaidman in [6], with a response by Salih et al in [7]. For an extensive bibliography, including references to some experiments, see [8,9].…”

Section: Introductionmentioning

confidence: 99%

Particle path through a nested Mach-Zehnder interferometer

Griffiths

2016

Phys. Rev. A

View full text Add to dashboard Cite

Possible paths of a photon passing through a nested Mach-Zehnder interferometer on its way to a detector are analyzed using the consistent histories formulation of quantum mechanics, and confirmed using a set of weak measurements (but not weak values). The results disagree with an analysis by Vaidman [ Phys. Rev. A 87 (2013) 052104 ], and agree with a conclusion reached by Li et al. [ Phys. Rev. A 88 (2013) 046102 ]. However, the analysis casts serious doubt on the claim of Salih et al. (whose authorship includes Li et al.) [ Phys. Rev. Lett. 110 (2013) 170502 ] to have constructed a protocol for counterfactual communication: a channel which can transmit information even though it contains a negligible number of photons.

show abstract

Section: Introductionmentioning

confidence: 99%

Particle path through a nested Mach-Zehnder interferometer

Griffiths

2016

Phys. Rev. A

View full text Add to dashboard Cite

show abstract

“…Just as he claimed the photon was in the nested interferometer in the past, despite there being no way to enter it, so too, in the Zubairy proposal, he claims that photons are actually in the public communication channel, and the communication is therefore not counterfactual. This resulted in further debate [19,20].…”

mentioning

confidence: 99%

Can a Dove prism change the past of a single photon?

Alonso

Jordan

2015

Quantum Stud.: Math. Found.

View full text Add to dashboard Cite

We reexamine the thought experiment and real experiment of Danan et al. (Phys Rev Lett 111:240402, 2013), Vaidman (Phys Rev A 89:024102, 2014), Vaidman (Phys Rev A 87:052104, 2013, by placing Dove prisms in the nested Mach-Zehnder interferometer arms. In those previous works, the criterion of whether a single photon was present, or not, was the presence of a "weak trace," indicating the presence of a nonzero weak value. This "weak trace" was tested by slightly varying the mirror angle at a given frequency, and then verifying whether this variation led to a signal at the corresponding frequency on a position-sensitive detector. We show that the presence of the Dove prisms gives identical weak values everywhere to the previous configuration because the prisms change neither the path difference, nor the mode profile in the aligned case. Nevertheless, the same slight variations of the interferometer mirrors now give a signal at the first mirror of the nested interferometer, indicating the photons entered the inner interferometer by the weak trace criterion. We give several possible interpretations of this effect.

show abstract

“…In this paper I do not provide many details of calculations. Some of the results presented below appear in more detail in [4], the methods of which can help to reconstruct new results appearing here. Note, that the approach and some of the ideas presented in this work I applied in the past, criticising other "counterfactual" protocols [5,6].…”

Section: Introductionmentioning

confidence: 92%

“Counterfactual” quantum protocols

Vaidman

2016

Int. J. Quantum Inform.

Self Cite

View full text Add to dashboard Cite

The counterfactuality of recently proposed protocols is analyzed. A definition of 'counterfactuality' is offered and it is argued that an interaction-free measurement of the presence of an opaque object can be named 'counterfactual', while proposed "counterfactual" measurements of the absence of such objects are not counterfactual. The quantum key distribution protocols which rely only on measurements of the presence of the object are counterfactual, but quantum direct communication protocols are not. Therefore, the name 'counterfactual' is not appropriate for recent "counterfactual" protocols which transfer quantum states by quantum direct communication.

show abstract

Counterfactuality of “counterfactual” communication

Cited by 14 publications

References 36 publications

Particle path through a nested Mach-Zehnder interferometer

Particle path through a nested Mach-Zehnder interferometer

Can a Dove prism change the past of a single photon?

“Counterfactual” quantum protocols

Contact Info

Product

Resources

About