Experiment on scalable multi-user twin-field quantum key distribution
network
- URL: http://arxiv.org/abs/2106.07768v1
- Date: Mon, 14 Jun 2021 21:41:32 GMT
- Title: Experiment on scalable multi-user twin-field quantum key distribution
network
- Authors: Xiaoqing Zhong, Wenyuan Wang, Reem Mandil, Hoi-Kwong Lo and Li Qian
- Abstract summary: We experimentally demonstrate a proof-of-principle multi-user-pair Sagnac TFQKD network where three user pairs share the same measurement station.
It is to our knowledge the first multi-user-pair TFQKD network demonstration, an important step in advancing quantum communication network technologies.
- Score: 2.61793967714497
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- 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
pair-wise TFQKD through time multiplexing, with channel losses up to 58 dB, and
channel loss asymmetry up to 15 dB. In some cases, the secure key rates still
beat the rate-loss bounds for point-to-point repeaterless QKD systems, even in
this network configuration. It is to our knowledge the first multi-user-pair
TFQKD network demonstration, an important step in advancing quantum
communication network technologies.
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