2011/06/09 by Rikizo Ikuta, Yoshiaki Kusaka, Tsuyoshi Kitano +4 · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1038/ncomms1544
published as Nature Communications 2 537 (2011) · 5 pages, 4 figures
arxiv created 2011/06/09 · arxiv updated 2011/12/02
We perform the first demonstration of a quantum interface for frequency down-conversion from visible to telecommunication bands by using a nonlinear crystal. This interface has a potential to work over wide bandwidths, leading to a high-speed interface of frequency conversion. We achieve the conversion of a pico-second visible photon at 780 nm to a 1522-nm photon, and observe that the conversion process retain entanglement between the down-converted photon and another photon.