Reference-frame-independent quantum key distribution with source flaws

Wang, Can; Sun, Shi-Hai; Ma, Xiang-Chun; Tang, Guang-Zhao; Liang, Lin-Mei

doi:10.1103/physreva.92.042319

Cited by 40 publications

(28 citation statements)

References 34 publications

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“…We consider the channel model proposed by Ref. [32,35], where the conditional probability that Bob obtain j when he chooses χ basis for measurement given that Alice sent him the state |α i can be written as V χj |αi =ηT χj |αi (1 − e d ) + (1 − η) e d (1 − e d )…”

Section: For the Single-photon Sourcementioning

confidence: 99%

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Reference-Frame-Independent Quantum Key Distribution Using Fewer States

Liu

Wang

et al. 2019

Phys. Rev. Applied

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Reference-frame-independent quantum key distribution (RFI QKD) protocol can reduce the requirement on the alignment of reference frames in practical systems. However, comparing with the Bennett-Brassard (BB84) QKD protocol, the main drawback of RFI QKD is that Alice needs to prepare six encoding states in the three mutually unbiased bases (X, Y ,and Z), and Bob also needs to measures the quantum state with such three bases. Here, we show that the RFI QKD protocol can be secured in the case where Alice sends fewer states. In particular, we find that transmitting three states (two eigenstates of the Z basis and one of the eigenstates in the X basis) is sufficient to obtain the comparable secret key rates and the covered distances, even when the security against coherent attacks with statistical fluctuations of finite-key size is considered. Finally, a proof-of-principle experiment based on time-bin encoding is demonstrated to show the feasibility of our scheme, and its merit to simplify the experimental setup.

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Section: For the Single-photon Sourcementioning

confidence: 99%

“…In this case, according to the decoy state method [35], the overall gain, given that Alice sends a state |α i using k ∈ K intensity and Bob obtains a state |χ j , can be written as…”

Section: For the Wcs With Decoy Techniquementioning

confidence: 99%

Reference-Frame-Independent Quantum Key Distribution Using Fewer States

Liu

Wang

et al. 2019

Phys. Rev. Applied

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“…To investigate the performance of C against β, we temporarily set μ=0.6, ν=0.1, and L=100, which obviously will not change the behavior of C against β. First, with equations (16), (21), we can demonstrate C is a periodic function of β by calculations, and the minimal positive period of C is p 2 . In other words,…”

Section: Cosmentioning

confidence: 99%

“…With the above demonstration, we consider the reasonable data set N=10 11 for statistical fluctuations [31] in practical RFI-QKD systems, and investigate its performance in p ⎡ ⎣ ⎤ ⎦ 0, 2 by the full parameter optimization method [32]. Notice that the domain p ⎡ ⎣ ⎤ ⎦ 0, 2 is ample to study the performance of practical RFI-QKD systems due to the periodicity of equations (17) or (21). For comparison purpose, we investigate the performance of practical RFI-QKD with b = p p p p 0, , , ,…”

Section: Simulationmentioning

confidence: 99%

“…To date, there have been a lot of theoretical and experimental reports on RFI-QKD [16][17][18][19][20][21][22][23][24][25][26] due to its immunity against the slow drift of reference frames. However, the performance of practical RFI-QKD systems worsens with the increasing drift of reference frames, and their performance will become the worst when the relative rotation of reference frames reaches its maximum.…”

Section: Introductionmentioning

confidence: 99%

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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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Reference‐Frame‐Independent Mode‐Pairing Quantum Key Distribution with Advantage Distillation

Li,

Sun,

Liu

et al. 2024

Adv Quantum Tech

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The coordination between distance and the secure key rate is one of the main challenges in the practical application of quantum key distribution (QKD). Mode‐pairing quantum key distribution is one of the schemes that can surpass the secret key capacity for repeaterless QKD. However, the protocol utilizes phase to encode the information, which leads to the problem of active stabilization in the interferometer. In this paper, a reference‐frame‐independent mode‐pairing quantum key distribution (RFI‐MP‐QKD) is proposed as an effective scheme to solve this problem. Moreover, the performance of the RFI‐MP‐QKD protocol is improved by applying the Advantage Distillation (AD) method in data post‐processing, which separates the highly correlated raw key bits from the weakly correlated information. The simulation results show that the secure key rate of RFI‐MP‐QKD has almost no degradation for reference frame deviation angles of . Compared to RFI‐MP‐QKD without AD method, the AD method decreases the quantum bit error rate from 0.04 to 0.012 and increases the maximum transmission distance from 406 to 450 km. The scheme proposed is expected to facilitate the practical implementation of RFI‐MP‐QKD, especially in cases of concerning reference frame alignment and high channel loss.

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Reference-frame-independent quantum key distribution with source flaws

Cited by 40 publications

References 34 publications

Reference-Frame-Independent Quantum Key Distribution Using Fewer States

Reference-Frame-Independent Quantum Key Distribution Using Fewer States

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

Reference‐Frame‐Independent Mode‐Pairing Quantum Key Distribution with Advantage Distillation

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