Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunable decoherence in the vicinity of a normal metal-superconducting
  junction   The decoherence rate of a quantum dot coupled to a fluctuating environment
described by a normal-metal superconductor junction is considered. The
density-density correlator at low frequencies constitutes the kernel which
enters the calculation of the phase coherence time. The density fluctuations
are connected to the finite frequency current-current correlations in the point
contact via the continuity equation. Below and above the gap, at zero
temperature the density correlator contains spatial oscillations at half of the
Fermi wave length on the normal side. As the bias crosses the superconducting
gap, the opening of new scattering channels enhances the decoherence rate
dramatically, suggesting the possibility of tuning the decoherence rate in a
controllable manner.

24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat