Making the decoy-state measurement-device-independent quantum key distribution practically useful

Zhou, Ying; Yu, Zhi‐Wu; Wang, Xiang-Bin

doi:10.1103/physreva.93.042324

Cited by 254 publications

(196 citation statements)

References 75 publications

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“…In addition, recently we notice some novel work individually done by Xu et al [45] and Wang et al [46]. The finite data size effects are analyzed and full parameter optimization are applied, they both dramatically improve the key generation rate of MDI-QKD with a few decoy-states, making the MDI-QKD practically useful.…”

Section: Numerical Simulationsmentioning

confidence: 98%

An enhanced proposal on decoy-state measurement device-independent quantum key distribution

Wang

Zhang

Luo

et al. 2016

Quantum Inf Process

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By employing pulses involving three-intensity, we propose a scheme for the measurement device-independent quantum key distribution with heralded singlephoton sources. We make a comparative study of this scheme with the standard threeintensity decoy-state scheme using weak coherent sources or heralded single-photon sources. The advantage of this scheme is illustrated through numerical simulations: It can approach very closely the asymptotic case of using an infinite number of decoystates and exhibits excellent behavior in both the secure transmission distance and the final key generation rate.

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Section: Numerical Simulationsmentioning

confidence: 98%

An enhanced proposal on decoy-state measurement device-independent quantum key distribution

Wang

Zhang

Luo

et al. 2016

Quantum Inf Process

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“…Because of the statistical fluctuations, the observables (gains) we obtain in the Z basis might deviate from their respective expected values, which will lie within a certain 'confidence interval' around the observed values. Here we will perform a standard error analysis, similar to that in [15,22,25], which is meant to be a straightforward estimation of the performance of TF-QKD under asymmetry and with practical data size, but not as a rigorous proof for composable security.…”

Section: A2 Finite-size Effectsmentioning

confidence: 99%

Simple method for asymmetric twin-field quantum key distribution

Wang

2020

New J. Phys.

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Twin-field quantum key distribution (TF-QKD) can beat the linear bound of repeaterless QKD systems. After the proposal of the original protocol, multiple papers have extended the protocol to prove its security. However, these works are limited to the case where the two channels have equal amount of loss (i.e. are symmetric). In a practical network setting, it is very likely that the channels are asymmetric due to e.g. geographical locations. In this paper we extend the 'simple TF-QKD' protocol to the scenario with asymmetric channels. We show that by simply adjusting the two signal states of the two users (and not the decoy states) they can effectively compensate for channel asymmetry and consistently obtain an order of magnitude higher key rate than previous symmetric protocol. It also can provide 2-3 times higher key rate than the strategy of deliberately adding fibre to the shorter channel until channels have equal loss (and is more convenient as users only need to optimize their laser intensities and do not need to physically modify the channels). We also perform simulation for a practical case with three decoy states and finite data size, and show that our method works well and has a clear advantage over prior art methods with realistic parameters. maintain the same channel loss for all users (and users might join/leave a network at arbitrary locations). If channels are asymmetric, for prior art protocols, users would either have to suffer from much higher quantumbit-error-rate (QBER) and hence lower key rate, or would have to deliberately add fibre to the shorter channel to compensate for channel asymmetry, which is inconvenient (since it requires physically modifying the channels) and also provides sub-optimal key rate.Similar limitation to symmetric channels have been observed in MDI-QKD. In [15], we have proposed a method to overcome this limitation, by allowing Alice and Bob to adjust their intensities (and use different optimization strategies for two decoupled bases) to compensate for channel loss, without having to physically adjust the channels. The method has also been successfully experimentally verified for asymmetric .In this work, we will apply our method to TF-QKD and show that it is possible to obtain good key rate through asymmetric channels by adjusting Alice's and Bob's intensities-in fact, we will show that, Alice and Bob only need to adjust their signal intensities to obtain optimal performance. We show that the security of the protocol is not affected, and that an order of magnitude higher (than symmetric protocol) or 2-3 times higher (than adding fibre) key rate can be achieved with the new method. Furthermore, we show with numerical simulation results that our method works well for both finite-decoy and finite-data case with practical parameters, making it a convenient and powerful method to improve the performance of TF-QKD through asymmetric channels in reality.While we use the same main idea of allowing Alice and Bob to use asymmetric intensities to compensate for asymmetric channe...

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“…Based on the theory of quantum physics, quantum key distribution (QKD) [1] provides a way of generating information-theoretic secure keys between two distant parties Alice and Bob, even in the presence of a malicious eavesdropper Eve. Since the first Bennett-Brassard-1984 (BB84) protocol was proposed in 1984, a series of works have been made to improve the practical performance of QKD systems [2][3][4][5][6][7][8][9][10][11][12][13][14]. Generally, in most of these systems, the complicated and real-time operation of calibrating reference frames is indispensable to assure the regular running of practical QKD systems [4,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Practical reference-frame-independent quantum key distribution systems against the worst relative rotation of reference frames

2018

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Reference-frame-independent quantum key distribution (RFI-QKD) can generate secret keys with the slow drift of reference frames. However, the performance of practical RFI-QKD systems deteriorates with the increasing drift of reference frames. In this paper, we mathematically demonstrate the worst relative rotation of reference frames for practical RFI-QKD systems, and investigate the corresponding performance with optimized system parameters. Simulation results show that practical RFI-QKD systems can achieve quite good performance against the worst relative rotation of reference frames, which exhibit the feasibility of practical QKD systems with free drifting reference frames. Furthermore, we propose a universal estimation method of the secret key rate in practical RFI-QKD systems, which conforms to the nature of RFI-QKD more well than the usual estimation method.

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Making the decoy-state measurement-device-independent quantum key distribution practically useful

Cited by 254 publications

References 75 publications

An enhanced proposal on decoy-state measurement device-independent quantum key distribution

An enhanced proposal on decoy-state measurement device-independent quantum key distribution

Simple method for asymmetric twin-field quantum key distribution

Practical reference-frame-independent quantum key distribution systems against the worst relative rotation of reference frames

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