PT Journal
AU Słysz, W
   Węgrzecki, M
   Bar, J
   Grabiec, P
   Górska, M
   Zwiller, V
   Latta, C
   Bohi, P
   Milostnaya, I
   Minaeva, O
   Antipov, A
   Okunev, O
   Korneev, A
   Smirnov, K
   Voronov, B
   Kaurova, N
   Gol’tsman, G
   Pearlman, A
   Cross, A
   Komissarov, I
   Verevkin, A
   Sobolewski, R
TI Fiber-coupled single-photon detectors based on NbN superconducting nanostructures for practical quantum cryptography and photon-correlation studies
SO Appl. Phys. Lett.
JI Appl. Phys. Lett.
PY 2006
BP 261113 (1 to 3)
VL 88
IS 26
DI 10.1063/1.2218105
DE SSPD; SNSPD
AB We have fabricated and tested a two-channel single-photon detector system based on two fiber-coupled superconducting single-photon detectors (SSPDs). Our best device reached the system quantum efficiency of 0.3% in the 1540-nm telecommunication wavelength with a fiber-to-detector coupling factor of about 30%. The photoresponse consisted of 2.5-ns-wide voltage pulses with a rise time of 250ps and timing jitter below 40ps. The overall system response time, measured as a second-order, photon cross-correlation function, was below 400ps. Our SSPDs operate at 4.2K inside a liquid-helium Dewar, but their optical fiber inputs and electrical outputs are at room temperature. Our two-channel detector system should find applications in practical quantum cryptography and in antibunching-type quantum correlation measurements.The authors would like to thank Dr. Marc Currie for his assistance in early time-resolved photoresponse measurements and Professor Atac Imamoglu for his support. This work was supported by the Polish Ministry of Science under Project No. 3 T11B 052 26 (Warsaw), RFBR 03-02-17697 and INTAS 03-51-4145 grants (Moscow), CRDF Grant No. RE2-2531-MO-03 (Moscow), RE2-2529-MO-03 (Moscow and Rochester), and US AFOSR FA9550-04-1-0123 (Rochester). Additional funding was provided by the grants from the MIT Lincoln Laboratory and BBN Technologies Corp.
ER