Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Back-action noise in strongly interacting systems: the dc SQUID and the
  interacting quantum point-contact   We study the back-action noise and measurement efficiency (i.e. noise
temperature) of a dc SQUID amplifier, and equivalently, a quantum point contact
detector formed in a Luttinger liquid. Using a mapping to a dissipative
tight-binding model, we show that these systems are able to reach the quantum
limit even in regimes where several independent transport processes contribute
to the current. We suggest how this is related to the underlying integrability
of these systems.

32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin