Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
| Autor: | Taofiq K. Paraïso, Zhiliang Yuan, Y. S. Lo, Mirko Pittaluga, Robert I. Woodward, Andrew J. Shields, Marco Lucamarini, M. Minder |
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| Přispěvatelé: | Woodward, RI [0000-0002-5026-494X], Pittaluga, M [0000-0002-5700-3232], Minder, M [0000-0001-5922-9529], Yuan, ZL [0000-0001-5276-9151], Apollo - University of Cambridge Repository |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Computer Networks and Communications
Computer science QC1-999 Phase (waves) FOS: Physical sciences 02 engineering and technology Quantum key distribution 01 natural sciences law.invention 5102 Atomic Molecular and Optical Physics law 0103 physical sciences Computer Science (miscellaneous) Electronic engineering 010306 general physics Quantum information science Computer Science::Cryptography and Security Quantum Physics Physics Detector Statistical and Nonlinear Physics QA75.5-76.95 021001 nanoscience & nanotechnology Laser Computational Theory and Mathematics Electronic computers. Computer science Key (cryptography) Systems design 0210 nano-technology Quantum Physics (quant-ph) 51 Physical Sciences Communication channel Biotechnology |
| Zdroj: | npj Quantum Information, Vol 7, Iss 1, Pp 1-6 (2021) |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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