Abstract
We demonstrate the suitability of fiber-generated entangled photon pairs for practical quantum communications in the telecom band by measuring their properties with superconducting single-photon detectors that produce negligible dark counts. The photon pairs are created in approximately 5-ps duration windows at 50 MHz rate while the detectors are operated in ungated free running mode. We obtain a coincidence to accidental-coincidence ratio >80 with raw photon-counting data, i.e., without making any post-measurement corrections. Using a previously demonstrated counter-propagating scheme we also produce polarization-entangled photon pairs at 50-MHz rate, which in coincidence detection directly yield two-photon interference with a fringe visibility >98%.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1322-1327 |
| Number of pages | 6 |
| Journal | Optics Express |
| Volume | 15 |
| Issue number | 3 |
| DOIs | |
| State | Published - Feb 5 2007 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics