Fibre polarization state compensation in entanglement-based quantum key distribution
Yicheng Shi, Hou Shun Poh, Alexander Ling, Christian Kurtsiefer
TL;DR
This paper presents a dynamic polarization compensation technique for entanglement-based QKD over deployed telecom fibres, reducing errors caused by birefringence and routing geometry changes.
Contribution
It introduces a feedback-based compensation scheme with a stochastic optimization algorithm to dynamically correct polarization states in real-world fibre links.
Findings
Effective reduction of QBER in deployed fibre links
Successful implementation of real-time polarization compensation
Enhanced stability of entanglement-based QKD systems
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 dynamically compensating fibre-induced state alteration in a QKD system over deployed fibre. This compensation scheme includes a feedback loop that minimizes the QBER using a stochastic optimization algorithm.
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Taxonomy
TopicsQuantum Information and Cryptography · Quantum Computing Algorithms and Architecture · Optical Network Technologies