Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Qubit measurement using a quantum point contact with a quantum Langevin
  equation approach   We employ a quantum Langevin equation approach to establish non-Markovian
dynamical equations, on a fully microscopic basis, to investigate the
measurement of the state of a coupled quantum dot qubit by a nearby quantum
point contact. The ensuing Bloch equations allow us to examine qubit relaxation
and decoherence induced by measurement, and also the noise spectrum of meter
output current with the help of a quantum regression theorem, at arbitrary
bias-voltage and temperature. Our analyses provide a clear resolution of a
recent debate concerning the occurrence of a quantum oscillation peak in the
noise spectrum.

11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph