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We designed and experimentally demonstrated a silicon photonics-integratedtime-domain balanced homodyne detector (TBHD), whose optical part hasdimensions of 1.5 mm * 0.4 mm. To automatically and accurately balance thedetector, new variable optical attenuators were used, and a common moderejection ratio of 86.9 dB could be achieved. In the quantum tomographyexperiment, the density matrix and Wigner function of a coherent state werereconstructed with 99.97 % fidelity. The feasibility of this TBHD in acontinuous-variable quantum key distribution (CVQKD) system was alsodemonstrated. This facilitates the integration of the optical circuits of theCVQKD system based on the GG02 protocol on the silicon photonics chip usingTBHD.

Silicon photonics-integrated time-domain balanced homodyne detector in continuous-variable quantum key distribution