Finite-key security analysis of differential-phase-shift quantum key distribution

• URL: http://arxiv.org/abs/2301.09844v2
• Date: Wed, 31 May 2023 00:45:54 GMT
• Title: Finite-key security analysis of differential-phase-shift quantum key distribution
• Authors: Akihiro Mizutani, Yuki Takeuchi, Kiyoshi Tamaki
• Abstract summary: Differential-phase-shift (DPS) quantum key distribution (QKD) is one of the major QKD protocols that can be implemented with a simple setup using a laser source and a passive detection unit. An information-theoretic security proof of this protocol has been established in [npj Quant Inf. 5, 87] assuming the infinitely large number of emitted pulses. We show that this obstacle can be overcome by exploiting recently found novel concentration inequality, Kato's inequality.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Differential-phase-shift (DPS) quantum key distribution (QKD) is one of the major QKD protocols that can be implemented with a simple setup using a laser source and a passive detection unit. Recently, an information-theoretic security proof of this protocol has been established in [npj Quant. Inf. 5, 87 (2019)] assuming the infinitely large number of emitted pulses. To implement the DPS protocol in a real-life world, it is indispensable to analyze the security with the finite number of emitted pulses. The extension of the security proof to the finite-size regime requires the accommodation of the statistical fluctuations to determine the amount of privacy amplification. In doing so, Azuma's inequality is often employed, but unfortunately we show that in the case of the DPS protocol, this results in a substantially low key rate. This low key rate is due to a loose estimation of the sum of probabilities regarding three-photon emission whose probability of occurrence is very small. The main contribution of our work is to show that this obstacle can be overcome by exploiting the recently found novel concentration inequality, Kato's inequality. As a result, the key rate of the DPS protocol is drastically improved. For instance, assuming typical experimental parameters, a 3 Mbit secret key can be generated over 77 km for 8.3 hours, which shows the feasibility of DPS QKD under a realistic setup.

Related papers

• Sharp finite statistics for minimum data block sizes in quantum key distribution [0.0]
  We introduce an alternative solution that exploits a link between random sampling with and without replacement. Despite its simplicity, it notably boosts the achievable secret key rate. Bounds of this kind naturally fit in finite-key security proofs of decoy-state QKD schemes.
  arXiv  Detail & Related papers  (2024-10-05T09:30:55Z)
• Phase-Matching Quantum Key Distribution without Intensity Modulation [25.004151934190965]
  We propose a phase-matching quantum key distribution protocol without intensity modulation. Simulation results show that the transmission distance of our protocol could reach 305 km in telecommunication fiber. Our protocol provides a promising solution for constructing quantum networks.
  arXiv  Detail & Related papers  (2023-03-21T04:32:01Z)
• Tight finite-key analysis for mode-pairing quantum key distribution [21.81489337632085]
  We analyze the finite-key effect for the MP-QKD protocol with rigorous security proof against general attacks. We propose a six-state MP-QKD protocol and analyze its finite-key effect.
  arXiv  Detail & Related papers  (2023-02-27T02:35:52Z)
• Quantum Key Distribution Using a Quantum Emitter in Hexagonal Boron Nitride [48.97025221755422]
  We demonstrate a room temperature, discrete-variable quantum key distribution system using a bright single photon source in hexagonal-boron nitride. We have generated keys with one million bits length, and demonstrated a secret key of approximately 70,000 bits, at a quantum bit error rate of 6%. Our work demonstrates the first proof of concept finite-key BB84 QKD system realised with hBN defects.
  arXiv  Detail & Related papers  (2023-02-13T09:38:51Z)
• Device-Independent-Quantum-Randomness-Enhanced Zero-Knowledge Proof [25.758352536166502]
  Zero-knowledge proof (ZKP) is a fundamental cryptographic primitive that allows a prover to convince a verifier of the validity of a statement. As an efficient variant of ZKP, non-interactive zero-knowledge proof (NIZKP) adopting the Fiat-Shamir is essential to a wide spectrum of applications.
  arXiv  Detail & Related papers  (2021-11-12T13:36:43Z)
• Security of round-robin differential-phase-shift quantum key distribution protocol with correlated light sources [2.538209532048867]
  We prove that the RRDPS protocol is secure against any source imperfections by establishing a proof with the pulse correlations. Our numerical simulation based on the proof shows that the long-range pulse correlation does not cause a significant impact on the key rate.
  arXiv  Detail & Related papers  (2021-07-06T13:08:36Z)
• Round-robin differential phase-time-shifting protocol for quantum key distribution: theory and experiment [58.03659958248968]
  Quantum key distribution (QKD) allows the establishment of common cryptographic keys among distant parties. Recently, a QKD protocol that circumvents the need for monitoring signal disturbance, has been proposed and demonstrated in initial experiments. We derive the security proofs of the round-robin differential phase-time-shifting protocol in the collective attack scenario. Our results show that the RRDPTS protocol can achieve higher secret key rate in comparison with the RRDPS, in the condition of high quantum bit error rate.
  arXiv  Detail & Related papers  (2021-03-15T15:20:09Z)
• Finite-key analysis of loss-tolerant quantum key distribution based on random sampling theory [0.0]
  We propose an alternative security analysis of the LT protocol against general attacks. Our security proof provides considerably higher secret-key rates than the previous finite-key analysis.
  arXiv  Detail & Related papers  (2021-01-29T14:32:09Z)
• Improved DIQKD protocols with finite-size analysis [2.940150296806761]
  We show that positive randomness is achievable up to depolarizing noise values of $9.33%$, exceeding all previously known noise thresholds. We also develop a modification to random-key-measurement protocols, using a pre-shared seed followed by a "seed recovery" step.
  arXiv  Detail & Related papers  (2020-12-16T03:04:19Z)
• Tight finite-key analysis for generalized high-dimensional quantum key distribution [23.578892457164933]
  We propose a tight finite-key analysis suitable for generalized high-dimensional quantum key distribution protocols. Benefitting from our theory, high-dimensional quantum key distribution protocols with finite resources become experimentally feasible.
  arXiv  Detail & Related papers  (2020-08-08T12:33:53Z)
• Device-Independent Quantum Key Distribution with Random Key Basis [0.0]
  Device-independent quantum key distribution (DIQKD) is the art of using untrusted devices to distribute secret keys in an insecure network. We show that our protocol significantly improves over the original DIQKD protocol, enabling positive keys in the high noise regime for the first time.
  arXiv  Detail & Related papers  (2020-05-06T09:57:47Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.