Fibre polarization state compensation in entanglement-based quantum key distribution

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.

arXiv comment6 pages, 3 figures

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Cited by in corpus (10)

• Entangling single atoms over 33 km telecom fibre
• Continuous entanglement distribution over a transnational 248 km fibre link
• Polarization compensation methods for quantum communication networks
• State independent QKD
• A prescriptive method for fibre polarisation compensation in two bases
• Time-bin entanglement in the deterministic generation of linear photonic cluster states
• Non-local polarization alignment and control in fiber using feedback from correlated measurements of entangled photons
• Fast and Automated Optical Polarization Compensation of Fiber Unitaries
• BIFROST: A First-Principles Model of Polarization Mode Dispersion in Optical Fiber
• In situ quantum verification of polarization-stabilized optical channels