Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers

• URL: http://arxiv.org/abs/2105.06748v1
• Date: Fri, 14 May 2021 10:17:10 GMT
• Title: Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
• Authors: R. I. Woodward, Y. S. Lo, M. Pittaluga, M. Minder, T. K. Para\"iso, M. Lucamarini, Z. L. Yuan, A. J. Shields
• Abstract summary: Measurement-device-independent quantum key distribution (MDI-QKD) is a technique for quantum-secured communication. We introduce a simple and compact MDI-QKD system design at gigahertz clock rates with enhanced resilience to laser fluctuations. Our design enables secure key rates that improve upon the state of the art by an order of magnitude, up to 8 bps at 54 dB channel loss and 2 kbps in the finite-size regime for 30 dB channel loss.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Measurement-device-independent quantum key distribution (MDI-QKD) is a technique for quantum-secured communication that eliminates all detector side-channels, although is currently limited by implementation complexity and low secure key rates. Here, we introduce a simple and compact MDI-QKD system design at gigahertz clock rates with enhanced resilience to laser fluctuations - thus enabling free-running semiconductor laser sources to be employed without spectral or phase feedback. This is achieved using direct laser modulation, carefully exploiting gain-switching and injection-locking laser dynamics to encode phase-modulated time-bin bits. Our design enables secure key rates that improve upon the state of the art by an order of magnitude, up to 8 bps at 54 dB channel loss and 2 kbps in the finite-size regime for 30 dB channel loss. This greatly simplified MDI-QKD system design and proof-of-principle demonstration shows that MDI-QKD is a practical, high-performance solution for future quantum communication networks.

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