Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum detector tomography of a 2x2 multi-pixel array of
  superconducting nanowire single photon detectors   We demonstrate quantum detector tomography of a commercial 2x2 array of
superconducting nanowire single photon detectors. We show that
detector-specific figures of merit including efficiency, dark-count and
cross-talk probabilities can be directly extracted, without recourse to the
underlying detector physics. These figures of merit are directly identified
from just four elements of the reconstructed positive operator valued measure
(POVM) of the device. We show that the values for efficiency and dark-count
probability extracted by detector tomography show excellent agreement with
independent measurements of these quantities, and we provide an intuitive
operational definition for cross-talk probability. Finally, we show that
parameters required for the reconstruction must be carefully chosen to avoid
oversmoothing the data.

30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat