Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interplay between phonon downconversion efficiency, density of states at
  Fermi energy, and intrinsic energy resolution for microwave kinectic
  inductance detectors   Microwave Kinetic Inductance detectors (MKIDs) have been recognized as a
powerful new tool for single photon detection. These highly multiplexed
superconducting devices give timing and energy measurement for every detected
photon. However, the full potential of MKID single photon spectroscopy has not
been reached , the achieved energy resolution is lower than expected from first
principles. Here, we study the efficiency in the phonon downconversion process
following the absorption of energetic photons in MKIDs. Assuming previously
published material properties, we measure an average downconversion efficiency
for three TiN resonators is $\eta$=0.14. We discuss how this efficiency can
impact the intrinsic energy resolution of MKID, and how any uncertainty in the
unknown density of electron states at the Fermi energy directly affects the
efficiency estimations.

33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys