TY  - CONF
AU  - Ozhegov, R.
AU  - Elezov, M.
AU  - Kurochkin, Y.
AU  - Kurochkin, V.
AU  - Divochiy, A.
AU  - Kovalyuk, V.
AU  - Vachtomin, Y.
AU  - Smirnov, K.
AU  - Goltsman, G.
A2  - International Conference on Micro- and Nano-Electronics
ED  - Orlikovsky, A. A.
PY  - 2014
DA  - 2014//
TI  - Quantum key distribution over 300
T2  - Proc. SPIE
BT  - Proc. SPIE
SP  - 1F (1 to 9)
VL  - 9440
PB  - SPIE
KW  - SSPD
KW  - SNSPD applicatins
KW  - quantum key distribution
KW  - QKD
AB  - We discuss the possibility of polarization state reconstruction and measurement over 302 km by Superconducting Single- Photon Detectors (SSPDs). Because of the excellent characteristics and the possibility to be effectively coupled to singlemode optical fiber many applications of the SSPD have already been reported. The most impressive one is the quantum key distribution (QKD) over 250 km distance. This demonstration shows further possibilities for the improvement of the characteristics of quantum-cryptographic systems such as increasing the bit rate and the quantum channel length, and decreasing the quantum bit error rate (QBER). This improvement is possible because SSPDs have the best characteristics in comparison with other single-photon detectors. We have demonstrated the possibility of polarization state reconstruction and measurement over 302.5 km with superconducting single-photon detectors. The advantage of an autocompensating optical scheme, also known as "plugandplay" for quantum key distribution, is high stability in the presence of distortions along the line. To increase the distance of quantum key distribution with this optical scheme we implement the superconducting single photon detectors (SSPD). At the 5 MHz pulse repetition frequency and the average photon number equal to 0.4 we measured a 33 bit/s quantum key generation for a 101.7 km single mode ber quantum channel. The extremely low SSPD dark count rate allowed us to keep QBER at 1.6% level.
UR  - https://doi.org/10.1117/12.2180733
DO  - 10.1117/12.2180733
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1048), last updated on Wed, 12 May 2021 23:50:24 -0500
ID  - Ozhegov_etal2014
ER  -