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Article: Simple Multiuser Twin-Field Quantum Key Distribution Network
Title | Simple Multiuser Twin-Field Quantum Key Distribution Network |
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Authors | |
Issue Date | 2022 |
Publisher | American Physical Society. The Journal's web site is located at https://journals.aps.org/prapplied/ |
Citation | Physical Review Applied, 2022, v. 17 n. 1, p. article no. 014025 How to Cite? |
Abstract | Twin-field quantum key distribution (TFQKD) systems have shown great promise for implementing practical long-distance secure quantum communication due to its measurement-device-independent nature and its ability to offer fundamentally superior rate-loss scaling than point-to-point QKD systems. A surge of research and development effort in the last two years has produced many variants of protocols and experimental demonstrations. In terms of hardware topology, TFQKD systems interfering quantum signals from two remotely phase-locked laser sources are in essence giant Mach-Zehnder interferometers (MZIs) requiring active phase stabilization. Such configurations are inherently unsuitable for a TFQKD network, where more than one user pair share the common quantum measurement station, because it is practically extremely difficult, if not impossible, to stabilize MZIs of largely disparate path lengths, a situation that is inevitable in a multi-user-pair TFQKD network. On the other hand, Sagnac interferometer-based TFQKD systems exploiting the inherent phase stability of the Sagnac ring can implement asymmetric TFQKD, and are therefore eminently suitable for implementing a TFQKD network. In this work, we experimentally demonstrate a proof-of-principle multi-user-pair Sagnac TFQKD network where three user pairs sharing the same measurement station can perform pairwise TFQKD through time multiplexing, with channel losses up to 58.00 dB, and channel loss asymmetry up to 15.00 dB. In some cases, the secure key rates still beat the rate-loss bound for point-to-point repeaterless QKD systems, even in this network configuration. Our demonstration of this multi-user-pair TFQKD network is a step in advancing quantum-communication network technologies. |
Persistent Identifier | http://hdl.handle.net/10722/310595 |
ISSN | 2023 Impact Factor: 3.8 2023 SCImago Journal Rankings: 1.335 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Zhong, X | - |
dc.contributor.author | Wang, W | - |
dc.contributor.author | Mandil, R | - |
dc.contributor.author | Lo, HK | - |
dc.contributor.author | Qian, L | - |
dc.date.accessioned | 2022-02-07T07:59:00Z | - |
dc.date.available | 2022-02-07T07:59:00Z | - |
dc.date.issued | 2022 | - |
dc.identifier.citation | Physical Review Applied, 2022, v. 17 n. 1, p. article no. 014025 | - |
dc.identifier.issn | 2331-7019 | - |
dc.identifier.uri | http://hdl.handle.net/10722/310595 | - |
dc.description.abstract | Twin-field quantum key distribution (TFQKD) systems have shown great promise for implementing practical long-distance secure quantum communication due to its measurement-device-independent nature and its ability to offer fundamentally superior rate-loss scaling than point-to-point QKD systems. A surge of research and development effort in the last two years has produced many variants of protocols and experimental demonstrations. In terms of hardware topology, TFQKD systems interfering quantum signals from two remotely phase-locked laser sources are in essence giant Mach-Zehnder interferometers (MZIs) requiring active phase stabilization. Such configurations are inherently unsuitable for a TFQKD network, where more than one user pair share the common quantum measurement station, because it is practically extremely difficult, if not impossible, to stabilize MZIs of largely disparate path lengths, a situation that is inevitable in a multi-user-pair TFQKD network. On the other hand, Sagnac interferometer-based TFQKD systems exploiting the inherent phase stability of the Sagnac ring can implement asymmetric TFQKD, and are therefore eminently suitable for implementing a TFQKD network. In this work, we experimentally demonstrate a proof-of-principle multi-user-pair Sagnac TFQKD network where three user pairs sharing the same measurement station can perform pairwise TFQKD through time multiplexing, with channel losses up to 58.00 dB, and channel loss asymmetry up to 15.00 dB. In some cases, the secure key rates still beat the rate-loss bound for point-to-point repeaterless QKD systems, even in this network configuration. Our demonstration of this multi-user-pair TFQKD network is a step in advancing quantum-communication network technologies. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at https://journals.aps.org/prapplied/ | - |
dc.relation.ispartof | Physical Review Applied | - |
dc.rights | Copyright [2022] by The American Physical Society. This article is available online at [http://dx.doi.org/10.1103/PhysRevApplied.17.014025]. | - |
dc.title | Simple Multiuser Twin-Field Quantum Key Distribution Network | - |
dc.type | Article | - |
dc.identifier.email | Wang, W: wenyuanw@hku.hk | - |
dc.identifier.email | Lo, HK: hoikwong@hku.hk | - |
dc.identifier.authority | Wang, W=rp02838 | - |
dc.identifier.authority | Lo, HK=rp02679 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevApplied.17.014025 | - |
dc.identifier.scopus | eid_2-s2.0-85123454341 | - |
dc.identifier.hkuros | 331670 | - |
dc.identifier.volume | 17 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | article no. 014025 | - |
dc.identifier.epage | article no. 014025 | - |
dc.identifier.isi | WOS:000747025300002 | - |
dc.publisher.place | United States | - |