Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconducting nanowire single-photon detectors at a wavelength of 940
  nm   We develop single-photon detectors comprising single-mode fiber-coupled
superconducting nanowires, with high system detection efficiencies at a
wavelength of 940 nm. The detector comprises a 6.5-nm-thick, 110-nm-wide NbN
nanowire meander fabricated onto a Si substrate with a distributed Bragg
reflector for enhancing the optical absorptance. We demonstrate that, via the
design of a low filling factor (1/3) and active area ({\Phi} = 10 {\mu}m), the
system reaches a detection efficiency of ~60% with a dark count rate of 10 Hz,
a recovery time <12 ns, and a timing jitter of ~50 ps.

11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn