Implementation vulnerabilities in general quantum cryptography

Huang, Anqi; Barz, Stefanie; Andersson, Erika; Makarov, Vadim

doi:10.1088/1367-2630/aade06

Cited by 58 publications

(26 citation statements)

References 67 publications

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“…In Eq. (19), we assume that the random sampling of detections are i.i.d. The goal of estimating the smooth min-entropy H ǫ min X key B |E is to give an upper bound of the smooth max-entropy H ǫ max X key B |A n ω .…”

Section: B the Energy Testmentioning

confidence: 99%

Continuous-variable source-device-independent quantum key distribution against general attacks

Zhang

Chen

Weedbrook

et al. 2020

Sci Rep

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The continuous-variable quantum key distribution with entanglement in the middle, a semi-deviceindependent protocol, places the source in the untrusted third party between Alice and Bob, and thus has the advantage of high levels of security with the purpose of eliminating the assumptions about the source device. However, previous works considered the collective-attack analysis, which inevitably assumes that the states of the source has an identical and independently distributed (i.i.d) structure, and limits the application of the protocol. To solve this problem, we modify the original protocol by exploiting an energy test to monitor the potential high energy attacks an adversary may use. Our analysis removes the assumptions of the light source and the modified protocol can therefore be called source-device-independent protocol. Moreover, we analyze the security of the continuousvariable source-device-independent quantum key distribution protocol with a homodyne-homodyne structure against general coherent attacks by adapting a state-independent entropic uncertainty relation. The simulation results indicate that, in the universal composable security framework, the protocol can still achieve high key rates against coherent attacks under the condition of achievable block lengths.

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Section: B the Energy Testmentioning

confidence: 99%

Continuous-variable source-device-independent quantum key distribution against general attacks

Zhang

Chen

Weedbrook

et al. 2020

Sci Rep

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“…Eavesdroppers cannot get any useful information during a quantum communication process without introducing perturbations that inevitably reveal their interception [5]. However, eavesdroppers can exploit security loopholes that are introduced by non-ideal apparatuses and/or channels to attack practical quantum communication [6,7]. Quantum key distribution (QKD) is a useful quantum communication protocol that generates secure keys between separated parties in the presence of eavesdroppers [8].…”

Section: Introductionmentioning

confidence: 99%

Quantum secure direct communication based on single-photon Bell-state measurement

Long

2020

New J. Phys.

108

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Security loopholes exploiting the flaws of practical apparatus, especially non-ideal photon detectors, are pressing issues in practical quantum communication. We propose a simple quantum secure direct communication protocol based on single-photon Bell-state measurement and remove side-channel attacks on photon detectors. This quantum communication protocol in principle works in a deterministic way, and it does not require the two-photon interference of photons from independent sources. The single-photon Bell-state measurement with a unity efficiency can be constructed with only linear optics, which significantly simplifies its experimental implementation. Furthermore, we prove that our quantum secure direct communication protocol is immune to general detector-side-channel attacks.

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“…In their experimental system, the transmitter employs different laser diodes to prepare specific states. This practice might induce a side channel when pulse shape and pulse width vary for different laser diodes [34]. As for Ref.…”

Section: Introductionmentioning

confidence: 99%

280-km experimental demonstration of a quantum digital signature with one decoy state

et al. 2020

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Quantum digital signature (QDS) guarantee the unforgeability, nonrepudiation and transferability of signature messages with information-theoretical security, and hence has attracted much attention recently. However, most previous implementations of QDS showed relatively low signature rates or/and short transmission distance. In this paper, we report a proof-of-principle phase-encoding QDS demonstration using only one decoy state. Firstly, such method avoids the modulation of vacuum state, thus reducing experimental complexity and random number consumption. Moreover, incorporating with low-loss asymmetric Mach-Zehnder interferometers and real-time polarization calibration technique, we have successfully achieved higher signature rate, e.g., 0.98 bit/s at 103 km, and to date a record-breaking transmission distance over 280-km installed fibers. Our work represents a significant step towards real-world applications of QDS.

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Implementation vulnerabilities in general quantum cryptography

Cited by 58 publications

References 67 publications

Continuous-variable source-device-independent quantum key distribution against general attacks

Continuous-variable source-device-independent quantum key distribution against general attacks

Quantum secure direct communication based on single-photon Bell-state measurement

280-km experimental demonstration of a quantum digital signature with one decoy state

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