期刊
NEW JOURNAL OF PHYSICS
卷 25, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/acfcd4
关键词
silicon photonics; time-domain balanced homodyne detector; auto-balance; quantum tomography; continuous variable quantum key distribution
We have designed and experimentally demonstrated a silicon photonics-integrated time-domain balanced homodyne detector with excellent common mode rejection ratio. It has been successfully used in quantum tomography experiments and continuous-variable quantum key distribution systems.
We designed and experimentally demonstrated a silicon photonics-integrated time-domain balanced homodyne detector (TBHD), containing an optical part of dimensions of 1.5 mm x 0.4 mm. To automatically and accurately balance the detector, new variable optical attenuators were used, and a common mode rejection ratio of 86.9 dB could be achieved. In the quantum tomography experiment, the density matrix and Wigner function of a coherent state were reconstructed with 99.97% fidelity. The feasibility of this TBHD in a continuous-variable quantum key distribution (CVQKD) system was also demonstrated. Our TBHD technologies are expected to be used in silicon photonics-integrated CVQKD system and silicon photonics-integrated BB84 heterodyne system.
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