Experimental measurement-device-independent quantum digital signatures over a metropolitan network

Yin, Hua-Lei; Wang, Wei Long; Yan, Tang; Zhao, Qi; Liu, Hui; Sun, Xiaoqin; Zhang, Wei Jun; Li, Hao; Puthoor, Ittoop Vergheese; You, Lixing; Andersson, Erika; Wang, Zhen; Liu, Yang; Jiang, Xiao; Ma, Xiongfeng; Zhang, Qiang; Curty, Marcos; Chen, Teng Yun; Pan, Jian-Wei

doi:10.1103/physreva.95.042338

Cited by 62 publications

(22 citation statements)

References 28 publications

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“…This brings QDS in par with QKD in terms of practicality. Finally, MDI-QDS protocols, addressing measurement-device side-channel attacks, have been implemented over a metropolitan network [757] and at high rates by using a laser seeding technique together with a novel treatment of the finite-size effects [758].…”

Section: Proof-of-principlementioning

confidence: 99%

Advances in quantum cryptography

et al. 2020

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Section: Proof-of-principlementioning

confidence: 99%

Advances in quantum cryptography

et al. 2020

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“…In the last two decades, discrete-variable (DV) QDS protocols have first lifted this requirement [8][9][10][11] and then also have lifted the need for a trusted quantum channel [2,12], and have brought their hardware requirements closer to those of QKD [13]. Recently, DV QDS implementations based on deployed networks have been demonstrated successfully over metropolitan distances [14][15][16][17]. Indeed, in several QDS papers, a nascent form of quantum agility is mentioned, either explicity [14,16,18] or implicitly [15,17], but so far the comparison has always been that the distribution of quantum states for QDS is analogous-or in some cases identical-to that required for QKD.…”

Section: The Qds-b Protocolmentioning

confidence: 99%

“…Recently, DV QDS implementations based on deployed networks have been demonstrated successfully over metropolitan distances [14][15][16][17]. Indeed, in several QDS papers, a nascent form of quantum agility is mentioned, either explicity [14,16,18] or implicitly [15,17], but so far the comparison has always been that the distribution of quantum states for QDS is analogous-or in some cases identical-to that required for QKD. For example, Ref.…”

Section: The Qds-b Protocolmentioning

confidence: 99%

Agile and versatile quantum communication: signatures and secrets

Richter,

Thornton,

Khan

et al. 2020

Preprint

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Agile cryptography allows for a resource-efficient swap of a cryptographic core in case the security of an underlying classical cryptographic algorithm becomes compromised. In this paper, we suggest how this principle can be applied to the field of quantum cryptography. We explicitly demonstrate two quantum cryptographic protocols: quantum digital signatures (QDS) and quantum secret sharing (QSS), on the same hardware sender and receiver platform, with protocols only differing in their classical post-processing. The system is also suitable for quantum key distribution (QKD) and is highly compatible with deployed telecommunication infrastructures, since it uses standard quadrature phase shift keying (QPSK) encoding and heterodyne detection. For the first time, QDS protocols are modified to allow for postselection at the receiver, enhancing protocol performance. The cryptographic primitives QDS and QSS are inherently multipartite and we prove that they are secure not only when a player internal to the task is dishonest, but also when (external) eavesdropping on the quantum channel is allowed. In the first proof-of-principle demonstration of an agile quantum communication system, the quantum states were distributed at GHz rates. This allows for a one-bit message to be securely signed using our QDS protocols in less than 0.05 ms over a 2 km fiber link and in less than 0.2 s over a 20 km fiber link. To our knowledge, this also marks the first demonstration of a continuous-variable direct QSS protocol.

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“…Fortunately, all security loopholes on the detection side are closed by measurement-device-independent QKD (MDIQKD) [8], which introduces an untrusted third party, Charlie, to perform two-photon Bell-state measurement in the intermediate node. Thus far, MDIQKD has made many theoretical and experimental breakthroughs [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Breaking the Rate-Loss Bound of Quantum Key Distribution with Asynchronous Two-Photon Interference

Xie,

Lu,

Weng

et al. 2021

Preprint

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Twin-field quantum key distribution can overcome the repeaterless bound via single-photon interference. However, the requirements of phase-locking and phase-tracking techniques drastically increase the experimental complexity, economic cost and prohibit free-space realization. Inspired by the duality in entanglement, we herein present an asynchronous measurement-device-independent quantum key distribution protocol that can surpass the repeaterless bound even without phase locking and phase tracking. Leveraging the concept of time multiplexing, asynchronous two-photon Bell-state measurement is realized by postmatching two interference detection events. For a 1 GHz system, the new protocol reaches a transmission distance of 450 km without phase tracking. After further removing phase locking, our protocol is still capable of breaking the bound at 270 km by employing a 10 GHz system. Intriguingly, when using the same experimental techniques, our protocol has a higher key rate than the phase-matching-type twin-field protocol. In the presence of imperfect intensity modulation, it also has a significant advantage in terms of the transmission distance over the sending-or-not-sending type twin-field protocol. With high key rates and accessible technology, our work paves the way for realistic global quantum networks across space, air, and water to the ground.

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Experimental measurement-device-independent quantum digital signatures over a metropolitan network

Cited by 62 publications

References 28 publications

Advances in quantum cryptography

Advances in quantum cryptography

Agile and versatile quantum communication: signatures and secrets

Breaking the Rate-Loss Bound of Quantum Key Distribution with Asynchronous Two-Photon Interference

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