摘要
We introduce a stable, long-distance single- photon Sagnac interferometer, which has a balanced con-figuration to efficiently compensate phase drift caused by change of the fiber-optic path. By using time-division phase modulation, single-photon interference was realized at 1550 nm in a 5-km-long as well as 27-km-long Sagnac fiber loops, with a fringe visibility higher than 90% and long-term sta-bility. The stable performance of the single-photon interfer-ence indicated that the time-division phase-modulated Sag- nac interferometer might readily lead to practical applica-tions in single-photon routing and quantum cryptography.
We introduce a stable, long-distance single- photon Sagnac interferometer, which has a balanced con-figuration to efficiently compensate phase drift caused by change of the fiber-optic path. By using time-division phase modulation, single-photon interference was realized at 1550 nm in a 5-km-long as well as 27-km-long Sagnac fiber loops, with a fringe visibility higher than 90% and long-term sta-bility. The stable performance of the single-photon interfer-ence indicated that the time-division phase-modulated Sag- nac interferometer might readily lead to practical applica-tions in single-photon routing and quantum cryptography.
基金
supported by Shanghai Priority Academic Discipline and the National Fundamental Research Program(Grant No.2001CB309301).
关键词
单光子干涉
干涉仪
基本结构
相位补偿
时分相位调制
稳定性
量子密码
Sagnac single-photon interferometer, single-photon in-terference, single-photon routing, quantum cryptography.
