Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancing intrinsic detection efficiency of superconducting nanowire
  single-photon detectors via helium ion irradiation   Realizing an NbN superconducting nanowire single-photon detector (SNSPD) with
a 100% intrinsic detection efficiency (IDE) at the near-infrared wavelengths is
still challenging. Herein, we developed a post-processing method to increase
the IDE of NbN SNSPDs to near unity using a 20 keV helium ion irradiation. The
IDE enhancement was achieved owing to the ion-induced reduction of the
superconducting energy gap and the electron density of states at the Fermi
level, determined with the electrical and magnetic transport measurements. The
change in optical absorptance of the irradiated SNSPD was negligible as
confirmed by the measured optical reflectance and system detection efficiency
(SDE). Benefited with the IDE enhancement, the SDE of an irradiated device was
significantly increased from 49% to 92% at 2.2 K for a 1550 nm wavelength.

12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol