Direct quantum communication with almost invisible photons

Li, Zheng Hong; Al‐Amri, M.; Zubairy, M. Suhail

doi:10.1103/physreva.89.052334

Cited by 21 publications

(23 citation statements)

References 15 publications

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“…Hashmi et al paper [1] is a continuation of the hot discussion about the meaning of the past of a pre-and post-selected particle , which has a crucial importance for the controversy regarding counterfactual quantum protocols [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. The authors discussed three setups for which the approach [2] apparently has difficulties, claiming that for their third setup 'the prediction of the theory of the past of the particle is in clear contradiction with standard quant um mechanics'.…”

Section: Introductionmentioning

confidence: 99%

Comment on ‘Two-state vector formalism and quantum interference’

Vaidman

2018

J. Phys. A: Math. Theor.

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Hashmi et al (2016 J. Phys. A: Math. Theor. 49 345302) claimed that the approach to the past of a quantum particle introduced by Vaidman (2013 Phys. Rev. A 87 052104) has difficulties in certain examples and that it can even be refuted. Here I reply to their criticism showing that the approach provides a good explanation for all the examples they considered. It is fully consistent with standard quantum mechanics and provides a useful tool for analyzing interference experiments.

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Section: Introductionmentioning

confidence: 99%

Comment on ‘Two-state vector formalism and quantum interference’

Vaidman

2018

J. Phys. A: Math. Theor.

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“…These interpretational questions have led to a dispute with Zubairy and colleagues, about the actual counterfactuality of a counterfactual communication proposal. In that dispute, Zubairy claims there can be a secure communication channel between two parties by having both parties select on events that can be interpreted as having no photon inside the communication channel-this also relies on making a claim about where the photon was in the past, given certain detection results [16,17]. Vaidman criticized that proposal because it is a more complicated realization of the nested interferometer [18].…”

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confidence: 99%

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

Alonso

Jordan

2015

Quantum Stud.: Math. Found.

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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.

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“…In ref. 37 , a communication protocol utilizing invisible photons is discussed. It shows how one communicator, Alice, tells if Bob has applied a π phase shift to her “invisible” photon by double chained Mach-Zehnder interferometers.…”

Section: The Counterfactual Quantum Attackmentioning

confidence: 99%

“…Specifically, utilizing the same device proposed in ref. 37 , Eve shoots her own photon towards Bob to do the measurement. She needs to complete a measurement before Bob changes his operation, whether the operation is in message mode or control mode.…”

Section: The Counterfactual Quantum Attackmentioning

confidence: 99%

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Quantum Secure Group Communication

Zubairy

Al‐Amri

2018

Sci Rep

Self Cite

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We propose a quantum secure group communication protocol for the purpose of sharing the same message among multiple authorized users. Our protocol can remove the need for key management that is needed for the quantum network built on quantum key distribution. Comparing with the secure quantum network based on BB84, we show our protocol is more efficient and securer. Particularly, in the security analysis, we introduce a new way of attack, i.e., the counterfactual quantum attack, which can steal information by “invisible” photons. This invisible photon can reveal a single-photon detector in the photon path without triggering the detector. Moreover, the photon can identify phase operations applied to itself, thereby stealing information. To defeat this counterfactual quantum attack, we propose a quantum multi-user authorization system. It allows us to precisely control the communication time so that the attack can not be completed in time.

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Direct quantum communication with almost invisible photons

Cited by 21 publications

References 15 publications

Comment on ‘Two-state vector formalism and quantum interference’

Comment on ‘Two-state vector formalism and quantum interference’

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

Quantum Secure Group Communication

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