2012/07/06 by Rikizo Ikuta, Hiroshi Kato, Yoshiaki Kusaka +9 · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.87.010301
published as Phys. Rev. A 87, 010301(R) (2013) · 5 pages, 4 figures
arxiv created 2012/07/06 · arxiv updated 2013/04/02
We experimentally demonstrate a high-fidelity visible-to-telecommunication wavelength conversion of a photon by using a solid-state-based difference frequency generation. In the experiment, one half of a pico-second visible entangled photon pair at 780 nm is converted to a 1522-nm photon, resulting in the entangled photon pair between 780 nm and 1522 nm. Using superconducting single-photon detectors with low dark count rates and small timing jitters, we selectively observed well-defined temporal modes containing the two photons. We achieved a fidelity of 0.93 ± 0.04 after the wavelength conversion, indicating that our solid-state-based scheme can be used for faithful frequency down-conversion of visible photons emitted from quantum memories composed of various media.