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No-Switching Quantum Key Distribution Using Broadband Modulated Coherent Light

Lance, Andrew; Symul, Thomas; Sharma, Vikram; Weedbrook, C; Ralph, Timothy Cameron; Lam, Ping Koy


We realize an end-to-end no-switching quantum key distribution protocol using continuous-wave coherent light. We encode weak broadband Gaussian modulations onto the amplitude and phase quadratures of light beams. Our no-switching protocol achieves high secret key rate via a post-selection protocol that utilizes both quadrature information simultaneously. We establish a secret key rate of 25Mbits/s for a lossless channel and 1kbit/s for 90% channel loss, per 17 MHz of detected bandwidth,...[Show more]

CollectionsANU Research Publications
Date published: 2005
Type: Journal article
Source: Physical Review Letters
DOI: 10.1103/PhysRevLett.95.180503


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