Stable Polarization Entanglement based Quantum Key Distribution over Metropolitan Fibre network

ORAL

Abstract

We demonstrate a Quantum key distribution (QKD) system implemented with polarisation-entangled photons over telecom fibre network. The photon pairs are generated at telecom O-band with one side propagating through 10 km of deployed fibre. Drift of polarisation state over fibre is compensated using liquid crystal variable retarders to minimize the Quantum Bit Error Rate (QBER). This ensures stable, continuous QKD operation with an average QBER of 6.4% and a final key rate of 109 bits/s.

*This research is supported by the National Research Foundation,Prime Ministers Of-fice, Singapore under its Corporate Laboratory@University Scheme, National University ofSingapore, and Singapore Telecommunications Ltd.

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Presenters

  • yicheng shi

    • Centre for Quantum Technologies, National University of Singapore

Authors

  • yicheng shi

    • Centre for Quantum Technologies, National University of Singapore

  • Moe Thar Soe

    • Centre for Quantum Technologies, National University of Singapore

  • Hou Shun Poh

    • Centre for Quantum Technologies, National University of Singapore

  • James Anthony Grieve

    • Centre for Quantum Technologies, National University of Singapore

  • Christian Kurtsiefer

    • Centre for Quantum Technologies, National University of Singapore

  • Alexander Ling

    • Centre for Quantum Technologies
    • Centre for Quantum Technologies, National University of Singapore