TY  - JOUR
AU  - Słysz, W.
AU  - Wegrzecki, M.
AU  - Bar, J.
AU  - Grabiec, P.
AU  - Górska, M.
AU  - Zwiller, V.
AU  - Latta, C.
AU  - Böhi, P.
AU  - Pearlman, A. J.
AU  - Cross, A. S.
AU  - Pan, D.
AU  - Kitaygorsky, J.
AU  - Komissarov, I.
AU  - Verevkin, A.
AU  - Milostnaya, I.
AU  - Korneev, A.
AU  - Minayeva, O.
AU  - Chulkova, G.
AU  - Smirnov, K.
AU  - Voronov, B.
AU  - Gol’tsman, G. N.
AU  - Sobolewski, R.
PY  - 2007
DA  - 2007//
TI  - Fibre-coupled, single photon detector based on NbN superconducting nanostructures for quantum communications
T2  - J. Modern Opt.
JO  - J. Modern Opt.
SP  - 315
EP  - 326
VL  - 54
IS  - 2-3
KW  - NbN SSPD
KW  - SNSPD
AB  - We present a novel, two-channel, single photon receiver based on two fibre-coupled, NbN, superconducting, single photon detectors (SSPDs). The SSPDs are nanostructured superconducting meanders and are known for ultrafast and efficient detection of visible-to-infrared photons. Coupling between the NbN detector and optical fibre was achieved using a micromechanical photoresist ring placed directly over the SSPD, holding the fibre in place. With this arrangement, we obtained coupling efficiencies up to ∼30%. Our experimental results showed that the best receiver had a near-infrared system quantum efficiency of 0.33% at 4.2 K. The quantum efficiency increased exponentially with the photon energy increase, reaching a few percent level for visible-light photons. The photoresponse pulses of our devices were limited by the meander high kinetic inductance and had the rise and fall times of approximately 250 ps and 5 ns, respectively. The receiver's timing jitter was in the 37 to 58 ps range, approximately 2 to 3 times larger than in our older free-space-coupled SSPDs. We stipulate that this timing jitter is in part due to optical fibre properties. Besides quantum communications, the two-detector arrangement should also find applications in quantum correlation experiments.
SN  - 0950-0340
UR  - http://www.tandfonline.com/doi/abs/10.1080/09500340600779496
UR  - https://doi.org/10.1080/09500340600779496
DO  - 10.1080/09500340600779496
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1434), last updated on Sun, 16 May 2021 16:43:52 -0500
ID  - Slysz_etal2007
ER  -