Finite-key analysis for measurement-device-independent quantum key distribution

Song, Ting-Ting; Wen, Qiaoyan; Guo, Fen-Zhuo; Tan, Xiaoqing

doi:10.1103/physreva.86.022332

Cited by 38 publications

(19 citation statements)

References 22 publications

(37 reference statements)

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“…Moreover, finite-size corrections are necessary for giving realistic estimates. This can be done by adopting the formalism developed in [15][16][17] IV. CONCLUSIONS In this paper we have explored the possibility to enable long distance QKD without entanglement sources.…”

Section: Scheme With Weak Coherent Pulse Sourcesmentioning

confidence: 99%

Measurement-device-independent quantum key distribution with quantum memories

2014

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We generalize measurement-device-independent quantum key distribution [ H.-K. Lo, M. Curty, and B. Qi, Phys. Rev. Lett. 108, 130503 (2012) ] to the scenario where the Bell-state measurement station contains also heralded quantum memories. We find analytical formulas, in terms of device imperfections, for all quantities entering in the secret key rates, i.e., the quantum bit error rate and the repeater rate. We assume either single-photon sources or weak coherent pulse sources plus decoy states. We show that it is possible to significantly outperform the original proposal, even in presence of decoherence of the quantum memory. Our protocol may represent the first natural step for implementing a two-segment quantum repeater.

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Section: Scheme With Weak Coherent Pulse Sourcesmentioning

confidence: 99%

Measurement-device-independent quantum key distribution with quantum memories

2014

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“…Note that while we have not implemented error correction, we have used a realistic estimation of the error correction efficiency [8] to determine the potential secret key rate of our system. Furthermore, we did not consider finite key size effects in our proof-of-principle demonstration (in other words, we assumed that we could run our QKD devices during an infinitely long time and produce an infinite amount of measured data), which, in the case of MDI-QKD, have so far only been investigated using an overly conservative approach [39].…”

mentioning

confidence: 99%

Real-World Two-Photon Interference and Proof-of-Principle Quantum Key Distribution Immune to Detector Attacks

Rubenok

Slater²,

Chan³

et al. 2013

Phys. Rev. Lett.

342

358

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Several vulnerabilities of single-photon detectors have recently been exploited to compromise the security of quantum-key-distribution (QKD) systems. In this Letter, we report the first proof-of-principle implementation of a new quantum-key-distribution protocol that is immune to any such attack. More precisely, we demonstrated this new approach to QKD in the laboratory over more than 80 km of spooled fiber, as well as across different locations within the city of Calgary. The robustness of our fiber-based implementation, together with the enhanced level of security offered by the protocol, confirms QKD as a realistic technology for safeguarding secrets in transmission. Furthermore, our demonstration establishes the feasibility of controlled two-photon interference in a real-world environment and thereby removes a remaining obstacle to realizing future applications of quantum communication, such as quantum repeaters and, more generally, quantum networks.

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“…Nevertheless, so far the security of mdiQKD has only been proven in the asymptotic regime 23 , which assumes that Alice and Bob have access to an unlimited amount of resources, or in the finite regime but only against particular types of attacks 30,31 . In summary, until now, a rigorous security proof of mdiQKD that takes full account of the finite size effects [32][33][34] has appeared to be missing and, for this reason, the feasibility of long-distance implementations of mdiQKD within a reasonable time frame of signal transmission has remained undemonstrated.…”

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confidence: 99%

Finite-key analysis for measurement-device-independent quantum key distribution

et al. 2014

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Quantum key distribution promises unconditionally secure communications. However, as practical devices tend to deviate from their specifications, the security of some practical systems is no longer valid. In particular, an adversary can exploit imperfect detectors to learn a large part of the secret key, even though the security proof claims otherwise. Recently, a practical approach-measurement-device-independent quantum key distribution-has been proposed to solve this problem. However, so far its security has only been fully proven under the assumption that the legitimate users of the system have unlimited resources. Here we fill this gap and provide a rigorous security proof against general attacks in the finite-key regime. This is obtained by applying large deviation theory, specifically the Chernoff bound, to perform parameter estimation. For the first time we demonstrate the feasibility of long-distance implementations of measurement-device-independent quantum key distribution within a reasonable time frame of signal transmission.

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Finite-key analysis for measurement-device-independent quantum key distribution

Cited by 38 publications

References 22 publications

Measurement-device-independent quantum key distribution with quantum memories

Measurement-device-independent quantum key distribution with quantum memories

Real-World Two-Photon Interference and Proof-of-Principle Quantum Key Distribution Immune to Detector Attacks

Finite-key analysis for measurement-device-independent quantum key distribution

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