Interaction-free measurement based on nonclassical fourth-order interference

Noh, Tae-Gon; Hong, C. K.

doi:10.1088/1355-5111/10/4/006

Cited by 6 publications

(9 citation statements)

References 15 publications

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“…As we shall see, our IFM scheme gives a maximum fraction of successful (interaction-free) measurements greater than that obtained in Ref. [25].…”

Section: Interaction-free Measurement In the Modified Interferometer ...mentioning

confidence: 64%

“…Actually, our method generalises the original proposal of Elitzur and Vaidman (EV) who demonstrate the principle of an interaction-free measurement (IFM) by placing a perfect absorber in one arm of a standard Mach-Zehnder oneparticle interferometer [23,24]. A previous extension of EV's original scheme from single-particle to two-particle case has been recently carried out by Noh and Hong [25] who developed a new scheme of IFM that is based on nonclassical fourth-order (i.e. two-photon) interference effect.…”

Section: Interaction-free Measurement In the Modified Interferometer mentioning

confidence: 87%

“…Although the IFM scheme presented here is based on this same effect, it differs from that of Ref. [25] in that the latter utilizes a single Mach-Zehnder type two-photon interferometer, whereas the former utilizes two Mach-Zehnder type one-photon interferometers (see Fig. 1).…”

Section: Interaction-free Measurement In the Modified Interferometer ...mentioning

confidence: 99%

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Hardy-type experiment for the maximally entangled state: Illustrating the problem of subensemble postselection

Cereceda¹

1999

Physics Letters A

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By selecting a certain subensemble of joint detection events in a two-particle interferometer arrangement, a formal nonlocality contradiction of the Hardy type is derived for an ensemble of particle pairs configured in the maximally entangled state. It is argued, however, that the class of experiments exhibiting this kind of contradiction does not rule out the assumption of local realism.PACS: 03.65.Bz

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“…As we shall see, our IFM scheme gives a maximum fraction of successful (interaction-free) measurements greater than that obtained in Ref. [25].…”

Section: Interaction-free Measurement In the Modified Interferometer ...mentioning

confidence: 64%

Section: Interaction-free Measurement In the Modified Interferometer mentioning

confidence: 87%

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Hardy-type experiment for the maximally entangled state: Illustrating the problem of subensemble postselection

Cereceda¹

1999

Physics Letters A

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“…The idea of counterfactual quantum communication was initialized by interaction-free measurement [8][9][10], impressive with the phenomenon that an object can be detected without being intuitively measured. The first example, presented by Noh [5], was realized in a QKD protocol.…”

Section: Introductionmentioning

confidence: 99%

Improved Direct Counterfactual Quantum Communication

Zhang,

Liu

2014

Preprint

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Recently, a novel direct counterfactual quantum communication protocol was proposed using chained quantum Zeno effect. We found that this protocol is far from being widely used in practical channels, due to the side effect of "chained", which leads to a dramatic increase of the equivalent optical distance between Alice and Bob. Therefore, not only the transmission time of a single bit increases in multiple times, but also the protocol is more sensitive to the noise. Here, we proposed an improved protocol, in which quantum interference is employed to destroy the nested structure induced by "chained" effect. Moreover, we proved that a better counterfactuality is easier to be achieved, and showed that our protocol outperforms the former in the presence of noises.

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“…Bob performs a measurement on the received signal photon. Alice and Bob then obtain a perfectly correlated secret key by carrying out the subsequent classical 4 procedures of basis reconciliation, error correction, and privacy amplification.…”

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confidence: 99%

Counterfactual Quantum Cryptography

2009

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The 'quantum counterfactuality' is one of the most striking counterintuitive effects predicted by quantum mechanics. This paper shows that the counterfactual effect is not merely an interesting academic theme, but that it can also provide practical benefits in everyday life. Based on the quantum counterfactual effect, the task of a secret key distribution between two remote parties can be accomplished even when no particle carrying secret information is in fact transmitted. The secret key obtained in this way may be used for secure communications such as internet banking and military communications. This paper also shows that, in some cases, the mere possibility that an eavesdropper can commit a crime is sufficient to detect the eavesdropper, even though the crime is not in fact carried out. (It is still unclear whether the mere possibility that the eavesdropper can commit a crime is sufficient to punish him/her, even though he or she does not in fact do it!) In a sense, part of the story of the SF film Minority Report seems plausible. Quantum cryptography allows one to distribute a secret key between two remote parties using the fundamental principles of quantum mechanics. The well-known established paradigm for the quantum key distribution relies on the actual transmission of signal particle through a quantum channel. This paper shows that the task of a secret key distribution can be accomplished even though a particle carrying secret information is not in fact transmitted through the quantum channel. The proposed protocols can be implemented with current technologies and provide practical security advantages by eliminating the possibility that an eavesdropper can directly access the entire quantum system of each signal particle.

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Interaction-free measurement based on nonclassical fourth-order interference

Cited by 6 publications

References 15 publications

Hardy-type experiment for the maximally entangled state: Illustrating the problem of subensemble postselection

Hardy-type experiment for the maximally entangled state: Illustrating the problem of subensemble postselection

Improved Direct Counterfactual Quantum Communication

Counterfactual Quantum Cryptography

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