Abstract
We introduce a stable, long-distance single-photon 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 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 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.
| Original language | English |
|---|---|
| Pages (from-to) | 1704-1708 |
| Number of pages | 5 |
| Journal | Chinese Science Bulletin |
| Volume | 48 |
| Issue number | 16 |
| DOIs | |
| State | Published - 2003 |
| Externally published | Yes |
Keywords
- Quantum cryptography
- Sagnac single-photon interferometer
- Single-photon interference
- Single-photon routing