Twin-Field Quantum Key Distribution with Fully Discrete Phase Randomization

Currás-Lorenzo, Guillermo; Wooltorton, Lewis; Razavi, Mohsen

doi:10.1103/physrevapplied.15.014016

Cited by 15 publications

(8 citation statements)

References 32 publications

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“…We note that similar protocols with discrete phase randomization are discussed in Refs. [28] and [29]. However, these protocols adopt binary encoding essentially; the discrete phase randomization is used for a tight parameter estimation.…”

Section: Parameter Estimationmentioning

confidence: 99%

Reference-Frame-Independent Design of Phase-Matching Quantum Key Distribution

et al. 2021

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The recently proposed phase-matching quantum key distribution offers means to overcome the linear key rate-transmittance bound. Since the key information is encoded onto the phases of coherent states, the misalignment between the two remote reference frames would yield errors and significantly degrade the key generation rate from the ideal case. In this work, we propose a reference-frame-independent design of phase-matching quantum key distribution by introducing a high-dimensional key encoding space. With encoded phases spanning the unit circle, the error statistics at arbitrary fixed-phase-reference difference can be recovered and treated separately, from which the misalignment angle can be identified. By naturally extending the binary encoding symmetry and complementarity to high dimensions, we present a security proof of this high-dimensional phase-matching quantum key distribution and demonstrate with simulation that a 17-dimensional protocol is completely immune to any degree of fixed misalignment and robust to slow phase fluctuations. We expect the high-dimensional protocol to be a practical reference-frameindependent design for general phase-encoding schemes where high-dimensional encoding is relatively easy to implement.

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Section: Parameter Estimationmentioning

confidence: 99%

Reference-Frame-Independent Design of Phase-Matching Quantum Key Distribution

et al. 2021

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“…Based on one-time-pad [2] and principles of quantum mechanics, QKD has been developed rapidly [3][4][5][6][7][8]. There are two main streams of QKD that generate symmetric keys, discrete-variable QKD (DV-QKD) [9] and continuous-variable QKD (CV-QKD) [10]. DV-QKD systems are greatly developed, such as BB84 protocol [1], which uses the polarization of single-photon states as the information sequence.…”

Section: Introductionmentioning

confidence: 99%

Low-complexity adaptive reconciliation protocol for continuous-variable quantum key distribution

Jiang,

Xue,

Tang

et al. 2024

Quantum Sci. Technol.

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In continuous-variable quantum key distribution systems, reconciliation is a crucial step that significantly affects the secret key rate (SKR). The rateless protocol based on Raptor codes can achieve high reconciliation efficiency at low signal-to-noise ratios (SNRs). However, the high complexity of low-density parity-check (LDPC) codes used for the precoding in Raptor codes limits the speed of reconciliation. In this paper, we propose an adaptive reconciliation protocol by modifying Raptor codes. The length of random binary sequences is increased because we remove the LDPC precoding that adds redundancy. The modified Raptor codes reduce the complexity of encoding with better performance. The proposed protocol can achieve a reconciliation efficiency of 98.1% and reach a SKR higher than 2.5×10^3 bit/s at a SNR of -20dB, higher than previous protocols.

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“…To bridge this gap between theory and experiment, two works that analyzed the security of fully discrete-phase randomization TF-QKD protocol have been proposed [42][43][44] in these days. However, a security proof in the finite-key region is still missing.…”

Section: Introductionmentioning

confidence: 99%

Finite-Key Analysis for Quantum Key Distribution with Discrete-Phase Randomization

Wang

Yin

Jin

et al. 2023

Entropy

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Quantum key distribution (QKD) allows two remote parties to share information-theoretic secret keys. Many QKD protocols assume the phase of encoding state can be continuous randomized from 0 to 2π, which, however, may be questionable in the experiment. This is particularly the case in the recently proposed twin-field (TF) QKD, which has received a lot of attention since it can increase the key rate significantly and even beat some theoretical rate-loss limits. As an intuitive solution, one may introduce discrete-phase randomization instead of continuous randomization. However, a security proof for a QKD protocol with discrete-phase randomization in the finite-key region is still missing. Here, we develop a technique based on conjugate measurement and quantum state distinguishment to analyze the security in this case. Our results show that TF-QKD with a reasonable number of discrete random phases, e.g., 8 phases from {0,π/4,π/2,…,7π/4}, can achieve satisfactory performance. On the other hand, we find the finite-size effects become more notable than before, which implies that more pulses should be emit in this case. More importantly, as a the first proof for TF-QKD with discrete-phase randomization in the finite-key region, our method is also applicable in other QKD protocols.

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Twin-Field Quantum Key Distribution with Fully Discrete Phase Randomization

Abstract: This is a repository copy of Twin-field quantum key distribution with fully discrete phase randomization.

Cited by 15 publications

References 32 publications

Reference-Frame-Independent Design of Phase-Matching Quantum Key Distribution

Reference-Frame-Independent Design of Phase-Matching Quantum Key Distribution

Low-complexity adaptive reconciliation protocol for continuous-variable quantum key distribution

Finite-Key Analysis for Quantum Key Distribution with Discrete-Phase Randomization

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