DOI: 10.1364/oe.489253 ISSN:

Continuous-variable quantum key distribution with time-division dual-quadrature homodyne detection

Junsang Oh, Jeongsik Cho, June-Koo Kevin Rhee
  • Atomic and Molecular Physics, and Optics

We propose a novel heterodyne detection scheme for continuous-variable quantum key distribution (CVQKD), which measures both quadrature components of a quantum signal encoded in optical phase space. The proposed method uses time division to achieve identical performance to conventional heterodyne detection with only a single homodyne detection system. Our method also uses a Faraday-Michelson interferometer to make it independent of polarization drift and eliminate the need for dynamic polarization control. Our method is experimentally demonstrated using the Gaussian-modulated coherent-states (GMCS) protocol over a 20.06 km optical fiber channel, achieving an expected secret key rate of up to 0.187 Mbps.

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