Time–energy high-dimensional one-side device-independent quantum key distribution

Bao, Hai-Ze; Bao, Wan-Su; Wang, Yang; Chen, Ruike; Ma, Hongxin; Zhou, Chun; Li, Hongwei

doi:10.1088/1674-1056/26/5/050302

Cited by 6 publications

(5 citation statements)

References 60 publications

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“…Compared to the noiseless condition in figure 1(b), we can still outperform prior works [61][62][63] and maintain records of energy-time entanglement and quantum steering witness after distributing in a 50 km fiber link. Our findings from the quantum steering witness after a 50 km fiber distance suggest promising avenues for future experimental investigations into high-dimensional one-sided device-independent QKD, whose security is linked to the violation of quantum steering inequality [73][74][75].…”

Section: High-dimensional Time-bin Qkd and Epr Steering Witness Over ...mentioning

confidence: 84%

Large-alphabet time-bin quantum key distribution and Einstein–Podolsky–Rosen steering via dispersive optics

Chang,

Sarihan,

Cheng

et al. 2023

Quantum Sci. Technol.

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Quantum key distribution (QKD) has established itself as a groundbreaking technology, showcasing inherent security features that are fundamentally proven. Qubit-based QKD protocols that rely on binary encoding encounter an inherent constraint related to the secret key capacity. This limitation restricts the maximum secret key capacity to one bit per photon. On the other hand, qudit-based QKD protocols have their advantages in scenarios where photons are scarce and noise is present, as they enable the transmission of more than one secret bit per photon. While proof-of-principle entangled-based qudit QKD systems have been successfully demonstrated over the years, the current limitation lies in the maximum distribution distance, which remains at 20 km fiber distance. Moreover, in these entangled high-dimensional QKD systems, the witness and distribution of quantum steering have not been shown before. Here we present a high-dimensional time-bin QKD protocol based on energy-time entanglement that generates a secure finite-length key capacity of 2.39 bit/coincidences and secure cryptographic finite-length keys at 0.24 Mbits s−1 in a 50 km optical fiber link. Our system is built entirely using readily available commercial off-the-shelf components, and secured by nonlocal dispersion cancellation technique against collective Gaussian attacks. Furthermore, we set new records for witnessing both energy-time entanglement and quantum steering over different fiber distances. When operating with a quantum channel loss of 39 dB, our system retains its inherent characteristic of utilizing large-alphabet. This enables us to achieve a secure key rate of 0.30 kbits s−1 and a secure key capacity of 1.10 bit/coincidences, considering finite-key effects. Our experimental results closely match the theoretical upper bound limit of secure cryptographic keys in high-dimensional time-bin QKD protocols (Mower et al 2013 Phys. Rev. A 87 062322; Zhang et al 2014 Phys. Rev. Lett. 112 120506), and outperform recent state-of-the-art qubit-based QKD protocols in terms of secure key throughput using commercial single-photon detectors (Wengerowsky et al 2019 Proc. Natl Acad. Sci. 116 6684; Wengerowsky et al 2020 npj Quantum Inf. 6 5; Zhang et al 2014 Phys. Rev. Lett. 112 120506; Zhang et al 2019 Nat. Photon. 13 839; Liu et al 2019 Phys. Rev. Lett. 122 160501; Zhang et al 2020 Phys. Rev. Lett. 125 010502; Wei et al 2020 Phys. Rev. X 10 031030). The simple and robust entanglement-based high-dimensional time-bin protocol presented here provides potential for practical long-distance quantum steering and QKD with multiple secure bits-per-coincidence, and higher secure cryptographic keys compared to mature qubit-based QKD protocols.

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Section: High-dimensional Time-bin Qkd and Epr Steering Witness Over ...mentioning

confidence: 84%

Large-alphabet time-bin quantum key distribution and Einstein–Podolsky–Rosen steering via dispersive optics

Chang,

Sarihan,

Cheng

et al. 2023

Quantum Sci. Technol.

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“…Besides, our protocols are merely the (n, n) threshold protocols, which can be described by the fact that at least n agents must combine their sub-secrets together to recover the secret, and we will propose the (t, n) threshold protocol (with t < n) in the coming paper. Furthermore, the two-particle transform of Bell states may also have potential impacts on quantum key distribution, [37,38] quantum secure direct communication, quantum signature, and quantum secure multiparty computation, and so on, which is worth further exploration.…”

Section: Discussionmentioning

confidence: 99%

Dynamic quantum secret sharing protocol based on two-particle transform of Bell states

Bao

2018

Chinese Phys. B

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To solve the problems of updating sub-secrets or secrets as well as adding or deleting agents in the quantum secret sharing protocol, we propose a two-particle transform of Bell states, and consequently present a novel dynamic quantum secret sharing protocol. The new protocol can not only resist some typical attacks, but also be more efficient than the existing protocols. Furthermore, we take advantage of the protocol to establish the dynamic secret sharing of a quantum state protocol for two-particle maximum entangled states.

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“…With the development of quantum information technology, quantum entanglement is found to be an important physical resource that plays a significant role and has been widely used in quantum protocols, [1] such as quantum teleportation, [2,3] quantum key distribution (QKD), [4][5][6] quantum secure direct communication, [7][8][9][10][11] quantum machine learning, [12][13][14][15] and other important protocols. [16][17][18][19][20] Quantum entanglement can be divided into many types.…”

Section: Introductionmentioning

confidence: 99%

Direct measurement of the concurrence of hybrid entangled state based on parity check measurements

et al. 2019

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The hybrid entangled state is widely discussed in quantum information processing. In this paper, we propose the first protocol to directly measure the concurrence of the hybrid entangled state. To complete the measurement, we design parity check measurements (PCMs) for both the single polarization qubit and the coherent state. In this protocol, we perform three rounds of PCMs. The results show that we can convert the concurrence into the success probability of picking up the correct states from the initial entangled states. This protocol only uses polarization beam splitters, beam splitters, and weak cross-Kerr nonlinearities, which is feasible for future experiments. This protocol may be useful in future quantum information processing.

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Time–energy high-dimensional one-side device-independent quantum key distribution

Cited by 6 publications

References 60 publications

Large-alphabet time-bin quantum key distribution and Einstein–Podolsky–Rosen steering via dispersive optics

Large-alphabet time-bin quantum key distribution and Einstein–Podolsky–Rosen steering via dispersive optics

Dynamic quantum secret sharing protocol based on two-particle transform of Bell states

Direct measurement of the concurrence of hybrid entangled state based on parity check measurements

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