Twin-field quantum key distribution without optical frequency dissemination

• URL: http://arxiv.org/abs/2208.09347v2
• Date: Fri, 31 Mar 2023 11:58:08 GMT
• Title: Twin-field quantum key distribution without optical frequency dissemination
• Authors: Lai Zhou, Jinping Lin, Yumang Jing and Zhiliang Yuan
• Abstract summary: 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.
• Score: 0.35557219875516644
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Twin-field (TF) quantum key distribution (QKD) has rapidly risen as the most viable solution to long-distance secure fibre communication thanks to its fundamentally repeater-like rate-loss scaling. However, its implementation complexity, if not successfully addressed, could impede or even prevent its advance into real-world. To satisfy its requirement for twin-field coherence, all present setups adopted essentially a gigantic, resource-inefficient interferometer structure that lacks scalability that mature QKD systems provide with simplex quantum links. Here we introduce a novel technique that can stabilise an open channel without using a closed interferometer and has general applicability to phase-sensitive quantum communications. Using locally generated frequency combs to establish mutual coherence, 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.

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)
• Eavesdropper localization for quantum and classical channels via nonlinear scattering [58.720142291102135]
  Quantum key distribution (QKD) offers theoretical security based on the laws of physics. We present a novel approach to eavesdropper location that can be employed in quantum as well as classical channels. We demonstrate that our approach outperforms conventional OTDR in the task of localizing an evanescent outcoupling of 1% with cm precision inside standard optical fibers.
  arXiv  Detail & Related papers  (2023-06-25T21:06:27Z)
• Two-mode squeezing over deployed fiber coexisting with conventional communications [55.41644538483948]
  Multi-mode squeezing is critical for enabling CV quantum networks and distributed quantum sensing. To date, multi-mode squeezing measured by homodyne detection has been limited to single-room experiments. This demonstration enables future applications in quantum networks and quantum sensing that rely on distributed multi-mode squeezing.
  arXiv  Detail & Related papers  (2023-04-20T02:29:33Z)
• 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)
• Twin-field quantum key distribution without phase locking [18.013181607967322]
  We show an approach to recover the single-photon interference pattern and realize TF-QKD emphwithout phase locking. Our work provides a scalable and practical solution to TF-QKD, thus representing an important step towards its wide applications.
  arXiv  Detail & Related papers  (2022-12-08T15:03:12Z)
• 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)
• 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)
• Long-distance twin-field quantum key distribution with entangled sources [4.334669226849793]
  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.
  arXiv  Detail & Related papers  (2021-11-06T02:01:42Z)
• 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)
• Coherent phase transfer for real-world twin-field quantum key distribution [0.0]
  We develop a solution for the simultaneous key streaming and channel length control, and demonstrate it on a 206 km field-deployed fiber with 65 dB loss. Our technique reduces the quantum-bit-error-rate contributed by channel length variations to 1%, representing an effective solution for real-world quantum communications.
  arXiv  Detail & Related papers  (2020-12-30T15:40:07Z)

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.