Thursday, July 4, 2013

1307.0893 (H. Shibata et al.)

Superconducting nanowire single-photon detector with ultralow dark count
rate using cold optical filters

H. Shibata, K. Shimizu, H. Takesue, Y. Tokura
We report the fabrication of a superconducting nanowire single-photon detector (SSPD or SNSPD) with an ultralow dark count rate. By introducing optical band-pass filters at the input of the SSPD and cooling the filters at 3 K, the dark count rate is reduced to less than 1/100 at low bias. An SSPD with 0.1 cps dark count rate and 5.6% system detection efficiency at 1550 nm wavelength is obtained. We show that a quantum key distribution (QKD) over 300 km of fiber is possible based on a numerical calculation assuming a differential phase shift QKD protocol implemented with our SSPDs.
View original:

No comments:

Post a Comment