Security of quantum secure direct communication based on Wyner's wiretap channel theory

Wu, Jiawei; Lin, Zili; Yin, Liuguo; Long, Gui Lu

doi:10.1002/que2.26

Cited by 94 publications

(62 citation statements)

References 37 publications

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“…Meanwhile, the analysis based on experimental data of the practical fiber system also proves the performance of this method for the parameter estimation of CVQKD. By the way, with the research and development of the theory of quantum gravity information processing, 29,30 which can be regarded as promising new information processing resource, and with the realization of quantum computers on classical platforms, 31 the real‐time information processing for QKD and quantum secure direct communication 32 will come soon.…”

Section: Resultsmentioning

confidence: 99%

Blind channel estimation for continuous‐variable quantum key distribution

Chai

Cao

et al. 2020

Quantum Engineering

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Summary For the maximum‐likelihood parameter estimation (MPE) of continuous‐variable quantum key distribution (CVQKD), it sacrifices partial key when estimating the channel parameters, and when the channel is varying, even slowly, legitimate communication parties must constantly exchange partial input signal and output signal to update the channel estimation. Therefore, the MPE leads to the following problems in practical application: (a) MPE achieved by randomly sampling the states can not accurately reflect the dynamic channel; (b) there exist a trade‐off between the secret key rate (SKR) and the accuracy of parameter estimation in the finite‐size regime; and (c) information leakage may be caused by the correlation between key variables. In this article, a novel parameter estimation method for CVQKD is proposed without affecting the security, and the consistency between the method and the physical model is given. Experimental simulation results show that the method can effectively improve the SKR and secure propagation distance. The experimental verification of the proposed method is given through the fiber system. Besides, the security analysis demonstrates that the method is secure against entanglement‐distillation attack.

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Section: Resultsmentioning

confidence: 99%

Blind channel estimation for continuous‐variable quantum key distribution

Chai

Cao

et al. 2020

Quantum Engineering

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“…It is an interesting future topic to study the tolerable bit-error rate. However, the error-rate threshold 5.7% for the DL04-QSDC protocol using four nonorthogonal states in reference [58] is a good estimate of the upper bound. In practical implementation of this protocol, forward error correction [79] might be more practical and easier, and explicit correction codes should be constructed, like those in references [57,80].…”

Section: Discussionmentioning

confidence: 99%

“…A practical QSDC for intra-city communication is experimentally demonstrated by using concatenation of low-density parity check codes very recently [57]. Security analysis of QSDC has been done [57,58] by combining quantum mechanics with Wyner's wiretap channel theory [59]. Recently, Shapiro et al presented a quantum low probability of intercept protocol, which in principle can transmit private information directly with a rate of gigabits per second [60].…”

Section: Introductionmentioning

confidence: 99%

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

Long

2020

New J. Phys.

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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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“…QSDC relies on FEC coding, which is in stark contrast to classic QKD, where coding-aided post-processing is used [21]. In the pioneering contribution [22] the secrecy capacity of a practical DL04 QSDC system was estimated, while the security analysis of a two-step QSDC protocol was carried out in [23]. Based on this success, Qi et al conceived an error control coding scheme based on the concatenation of low-density parity-check (LDPC) codes and pseudorandom sequences for enhancing the communication reliability [22].…”

Section: Introductionmentioning

confidence: 99%

Toward Practical Quantum Secure Direct Communication: A Quantum-Memory-Free Protocol and Code Design

Sun

Song

Huang

et al. 2020

IEEE Trans. Commun.

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Quantum secure direct communication (QSDC) is capable of direct confidential communications over a quantum channel, which is achieved by dispensing with the key agreement channel of the well-known quantum key distribution (QKD). However, to make QSDC a practical reality, we have to mitigate its reliance on quantum memory, its immediate communication interruption caused by eavesdropping and its low transmission reliability due to the heavy qubit losses. Hence a new QSDC protocol is proposed based on a sophisticated coded singlephoton DL04 QSDC protocol to tackle the open challenges. In particular, quantum memory is dispensed with and a highaccuracy secrecy capacity estimate is derived for this protocol by conceiving dynamic joint encryption and error-control (JEEC) coding. We demonstrate that this quantum-memory-free DL04 QSDC (QMF-DL04 QSDC) protocol inches closer to the quantum channel's capacity and significantly improves the original DL04 QSDC's robustness. Moreover, a rate-compatible low-rate JEEC coding scheme is designed for the proposed framework, and the JEEC code advocated is shown to approach the secrecy capacity, despite tolerating an extremely high loss of qubits in the time-varying wiretap channel. Our simulations and experimental results demonstrate that the QMF-DL04 QSDC scheme significantly increases both the secure information rate and the communication distance of the original DL04 protocol.

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Security of quantum secure direct communication based on Wyner's wiretap channel theory

Cited by 94 publications

References 37 publications

Blind channel estimation for continuous‐variable quantum key distribution

Blind channel estimation for continuous‐variable quantum key distribution

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

Toward Practical Quantum Secure Direct Communication: A Quantum-Memory-Free Protocol and Code Design

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