Resource-Efficient Real-Time Polarization Compensation for MDI-QKD with Rejected Data

• URL: http://arxiv.org/abs/2209.02707v2
• Date: Tue, 23 Apr 2024 05:09:06 GMT
• Title: Resource-Efficient Real-Time Polarization Compensation for MDI-QKD with Rejected Data
• Authors: Olinka Bedroya, Chenyang Li, Wenyuan Wang, Jianyong Hu, Hoi-Kwong Lo, Li Qian,
• Abstract summary: Polarization alignment must be maintained over both mutually unbiased bases. Low key rates and cost are the two most pressing challenges preventing wide adoption of QKD systems. We propose and implement a novel polarization compensation scheme in the MDI-QKD system.
• Score: 5.942776602451944
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Measurement-device-independent quantum key distribution (MDI-QKD) closes all the security loopholes in the detection system and is a promising solution for secret key sharing. Polarization encoding is the most common QKD encoding scheme, as it is straightforward to prepare and measure. However, implementing polarization encoding in MDI QKD imposes extra challenges, as polarization alignment must be maintained over both mutually unbiased bases and be maintained for both paths (Alice-Charlie and Bob-Charlie). Polarization alignment is usually done by interrupting the QKD process (reducing overall key generation rates) or using additional classical laser sources multiplexed with quantum channels for polarization alignment. Since low key rates and cost are the two most pressing challenges preventing wide adoption of QKD systems, using additional resources or reducing key rates runs contrary to making QKD commercially viable. Therefore, we propose and implement a novel polarization compensation scheme in the MDI-QKD system that avoids the aforementioned drawbacks by recycling part of discarded detection events. Our scheme evaluates the polarization drift in real-time based on single measurements corresponding to decoy intensities. Our fully automated experimental demonstration maintains the average polarization drift below 0.13 rad over 40 km of spooled fibre (without an insulating jacket) for at least four hours. The average quantum bit error rate is 3.8$\%$, and we achieved an average key rate of $7.45\times 10^{-6}$ bits per pulse.

Related papers

• Polarization-encoded quantum key distribution with a room-temperature telecom single-photon emitter [47.54990103162742]
  Single photon sources (SPSs) are directly applicable in quantum key distribution (QKD) We report an observation of polarization-encoded QKD using a room-temperature telecom SPS based on a GaN defect.
  arXiv  Detail & Related papers  (2024-09-25T16:17:36Z)
• Mitigating imperfections in Differential Phase Shift Measurement-Device-Independent Quantum Key Distribution via Plug-and-Play architecture [1.8501505150450435]
  Measurement-device-independent quantum key distribution (MDI-QKD) was originally proposed as a means to address the issue of detector side-channel attacks. We present a plug-and-play scheme for MDI-QKD based on differential phase shift (DPS) encoding.
  arXiv  Detail & Related papers  (2024-09-09T17:08:44Z)
• Fast Flux-Activated Leakage Reduction for Superconducting Quantum Circuits [84.60542868688235]
  leakage out of the computational subspace arising from the multi-level structure of qubit implementations. We present a resource-efficient universal leakage reduction unit for superconducting qubits using parametric flux modulation. We demonstrate that using the leakage reduction unit in repeated weight-two stabilizer measurements reduces the total number of detected errors in a scalable fashion.
  arXiv  Detail & Related papers  (2023-09-13T16:21:32Z)
• High-rate quantum key distribution exceeding 110 Mb/s [26.392377190417413]
  Quantum key distribution (QKD) can provide proven security for secure communication. Here we report a QKD system that is able to generate key at a record high SKR of 115.8 Mb/s over 10-km standard fibre.
  arXiv  Detail & Related papers  (2023-07-05T15:25:25Z)
• 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)
• Silicon-based decoder for polarization-encoding quantum key distribution [14.746082911849474]
  Silicon-based polarization-encoding quantum key distribution (QKD) has been widely studied, owing to its low cost and robustness. In this paper, we propose a fully chip-based decoder for polarization-encoding QKD. Average quantum bit error rate of $0.56%$ was achieved through continuous operation for 10 h without any polarization feedback.
  arXiv  Detail & Related papers  (2022-12-08T00:47:43Z)
• Polarization correction towards satellite-based QKD without an active feedback [5.5438676149999075]
  Quantum key distribution (QKD) is a cryptographic protocol to enable two parties to share a secure key string. There has been an ongoing surge of interest in implementing long-haul photonic-implementation of QKD protocols. We propose an alternative approach where we first perform a state tomography to reconstruct the output density matrix.
  arXiv  Detail & Related papers  (2022-08-19T02:20:38Z)
• Efficient room-temperature molecular single-photon sources for quantum key distribution [51.56795970800138]
  Quantum Key Distribution (QKD) allows the distribution of cryptographic keys between multiple users in an information-theoretic secure way. We introduce and demonstrate a proof-of-concept QKD system exploiting a molecule-based single-photon source operating at room temperature and emitting at 785nm.
  arXiv  Detail & Related papers  (2022-02-25T11:52:10Z)
• Fibre polarization state compensation in entanglement-based quantum key distribution [62.997667081978825]
  Quantum Key Distribution (QKD) using polarisation encoding can be hard to implement over deployed telecom fibres. We show a technique for dynamically compensating fibre-induced alteration in a QKD system over deployed fibre.
  arXiv  Detail & Related papers  (2021-07-16T00:53:48Z)
• Measurement-device-independent quantum key distribution of multiple degrees of freedom of a single photon [6.887504495088555]
  Measurement-device-independent quantum key distribution (MDI-QKD) provides us a powerful approach to resist all attacks at detection side. In this paper, we provide an efficient approach to increase the key generation rate of MDI-QKD by adopting multiple degrees of freedom (DOFs) of single photons to generate keys.
  arXiv  Detail & Related papers  (2020-09-21T00:57:27Z)
• Loss-tolerant quantum key distribution with a twist [0.0]
  We provide an extension of the loss-tolerant protocol [Phys. Rev. A 90, 052314 (2014)], a leading proof technique for analyzing the security of QKD, to MDI QKD protocols that employ mixed signal states. We find that the mixed states can be interpreted as providing Alice and Bob with a virtual shield system they can employ to reduce Eve's knowledge of the secret key.
  arXiv  Detail & Related papers  (2020-07-16T12:37:43Z)

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.