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Title: Fibre polarisation state compensation in entanglement-based quantum key distribution
Authors: Shi, Yicheng 
Poh, Hou Shun 
Ling, Alexander 
Kurtsiefer, Christian 
Issue Date: 18-Oct-2021
Publisher: The Optical Society
Citation: Shi, Yicheng, Poh, Hou Shun, Ling, Alexander, Kurtsiefer, Christian (2021-10-18). Fibre polarisation state compensation in entanglement-based quantum key distribution. Optics Express 29 (23). ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Quantum key distribution (QKD) using polarisation encoding can be hard to implement over deployed telecom fibres because the routing geometry and the birefringence of the fibre link can alter the polarisation states of the propagating photons. These alterations cause a basis mismatch, leading to an increased quantum bit error rate (QBER). In this work we demonstrate a technique for a dynamically compensating fibre-induced state alteration in a QKD system. This compensation scheme includes a feedback loop that minimizes the QBER using a stochastic optimization algorithm. The effectiveness of this technique is implemented and verified in a polarisation entanglement QKD system over a deployed telecom fibre. © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
Source Title: Optics Express
ISSN: 1094-4087
DOI: 10.1364/oe.437896
Rights: Attribution 4.0 International
Appears in Collections:Staff Publications

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