| Time-division phase modulated single-photon interference in a Sagnac interferometer |
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| 作者姓名： | WUGuang ZHOUChunyuan ZENGHeping |
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| 作者单位： | KeyLaboratoryofOpticalandMagneticResonanceSpectroscopyandDepartmentofPhysics,EastChinaNormalUniversity,Shanghai200062,China |
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| 基金项目： | 上海先进学院校科研和教改项目 |
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| 摘 要： | We introduce a stable, long-distance singlephoton Sagnac interferometer, which has a balanced configuration 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 1550nm in a 5-km-long as well as 27-km-long Sagnac fiber loops,with a fringe visibility higher than 90% and long-term stability. The stable performance of the single-photon interference indicated that the time-division phase-modulated Sagnac interferometer might readily lead to practical applications in single-photon routing and quantum cryptography.
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| 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 |
| 收稿时间： | 2003-03-10 |
Time-division phase modulated single-photon interference in a Sagnac interferometer |
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| WUGuang ZHOUChunyuan ZENGHeping.Time-division phase modulated single-photon interference in a Sagnac interferometer[J].Chinese Science Bulletin,2003,48(16):1704-1708. |
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| Authors: | Wu Guang Zhou Chunyuan Zeng Heping |
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| Institution: | e-mail: hpzeng @phy.ecnu.edu.cn |
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| Abstract: | 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. |
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| Keywords: | Sagnac single-photon interferometer single-photon in-terference single-photon routing quantum cryptography |
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