Long-distance twin-field quantum key distribution with entangled sources

• URL: http://arxiv.org/abs/2111.03775v1
• Date: Sat, 6 Nov 2021 02:01:42 GMT
• Title: Long-distance twin-field quantum key distribution with entangled sources
• Authors: Bing-Hong Li, Yuan-Mei Xie, Zhao Li, Chen-Xun Weng, Chen-Long Li, Hua-Lei Yin, Zeng-Bing Chen
• Abstract summary: We propose a scheme to implement TFQKD with an entangled coherent state source in the middle to increase its range. Our work is a promising step toward long-distance secure communication and is greatly compatible with future global quantum network.
• Score: 4.334669226849793
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Twin-field quantum key distribution (TFQKD), using single-photon-type interference, offers a way to exceed the rate-distance limit without quantum repeaters. However, it still suffers from the photon losses and dark counts, which impose an ultimate limit on its transmission distance. In this letter, we propose a scheme to implement TFQKD with an entangled coherent state source in the middle to increase its range, as well as comparing its performance under coherent attacks with that of TFQKD variants. Simulations show that our protocol has a theoretical distance advantage of 400 kilometers. Moreover, the scheme has great robustness against the misalignment error and finite-size effects. Our work is a promising step toward long-distance secure communication and is greatly compatible with future global quantum network.

Related papers

• Twin-field quantum key distribution with local frequency reference [18.04679036242816]
  We propose and demonstrate a simple and practical approach to realize TF-QKD without requiring relative frequency control of the independent laser sources. We experimentally demonstrate the TF-QKD over 502 km, 301 km and 201 km ultra-low loss optical fiber respectively. We expect this high-performance scheme will find widespread usage in future intercity and free-space quantum communication networks.
  arXiv  Detail & Related papers  (2023-10-27T17:29:52Z)
• 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)
• Experimental Quantum Communication Overcomes the Rate-loss Limit without Global Phase Tracking [0.27264625806312304]
  We implement an innovative but simpler measurement-device-independent QKD which realizes repeater-like communication through asynchronous coincidence pairing. Over 413 and 508 km optical fibers, we achieve finite-size SKRs of 590.61 and 42.64 bit/s, which are respectively 1.80 and 4.08 times of their corresponding absolute rate limits. Our work will bring forward economical and efficient quantum-secure networks intercity.
  arXiv  Detail & Related papers  (2022-12-29T06:31:07Z)
• Single-emitter quantum key distribution over 175 km of fiber with optimised finite key rates [45.82374977939355]
  We perform fibre-based quantum key distribution with a quantum dot frequency-converted to telecom wavelength. We demonstrate positive key rates up to 175 km in the regime. This result represents major progress towards the feasibility of long-distance single-emitter QKD networks.
  arXiv  Detail & Related papers  (2022-09-07T18:03:36Z)
• Twin-field quantum key distribution without optical frequency dissemination [0.35557219875516644]
  We introduce a novel technique that can stabilise an open channel without using a closed interferometer. We develop a simple and versatile TF-QKD setup that does not need service fibre and can operate over links of 100 km asymmetry. We confirm the setup's repeater-like behaviour and obtain a finite-size rate of 0.32 bit/s at a distance of 615.6 km.
  arXiv  Detail & Related papers  (2022-08-19T13:56:14Z)
• Continuous entanglement distribution over a transnational 248 km fibre link [58.720142291102135]
  Entanglement is the basis of many quantum applications. We present a continuously working international link between Austria and Slovakia. We measure stable pair rates of 9 s$-1$ over an exemplary operation time of 110 hours.
  arXiv  Detail & Related papers  (2022-03-23T13:55:27Z)
• Towards fully-fledged quantum and classical communication over deployed fiber with up-conversion module [47.187609203210705]
  We propose and demonstrate a new method, based on up-conversion assisted receiver, for co-propagating classical light and QKD signals. Our proposal exhibits higher tolerance for noise in comparison to the standard receiver, thus enabling the distribution of secret keys in the condition of 4 dB-higher classical power.
  arXiv  Detail & Related papers  (2021-06-09T13:52:27Z)
• Path-encoded high-dimensional quantum communication over a 2 km multicore fiber [50.591267188664666]
  We demonstrate the reliable transmission over a 2 km long multicore fiber of path-encoded high-dimensional quantum states. A stable interferometric detection is guaranteed, allowing for low error rates and the generation of 6.3 Mbit/s of secret key rate.
  arXiv  Detail & Related papers  (2021-03-10T11:02:45Z)
• 600 km repeater-like quantum communications with dual-band stabilisation [0.4983856330186121]
  Twin-field (TF) quantum key distribution (QKD) fundamentally alters the rate-distance relationship of QKD, offering the scaling of a single-node quantum repeater. Recent experiments have demonstrated the new opportunities for secure long-distance communications allowed by TF-QKD, but formidable challenges remain. We introduce a novel dual-band stabilisation scheme that overcomes past limitations and can be adapted to other phase-sensitive single-photon applications.
  arXiv  Detail & Related papers  (2020-12-30T10:12:33Z)
• Direct Quantum Communications in the Presence of Realistic Noisy Entanglement [69.25543534545538]
  We propose a novel quantum communication scheme relying on realistic noisy pre-shared entanglement. Our performance analysis shows that the proposed scheme offers competitive QBER, yield, and goodput.
  arXiv  Detail & Related papers  (2020-12-22T13:06:12Z)
• Experimental quantum conference key agreement [55.41644538483948]
  Quantum networks will provide multi-node entanglement over long distances to enable secure communication on a global scale. Here we demonstrate quantum conference key agreement, a quantum communication protocol that exploits multi-partite entanglement. We distribute four-photon Greenberger-Horne-Zeilinger (GHZ) states generated by high-brightness, telecom photon-pair sources across up to 50 km of fibre.
  arXiv  Detail & Related papers  (2020-02-04T19:00:31Z)

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.