Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultimate sensitivity of precision measurements with Gaussian quantum
  light : a multi-modal approach   Multimode Gaussian quantum light, which includes multimode squeezed and
multipartite quadrature entangled light, is a very general and powerful quantum
resource with promising applications in quantum information processing and
metrology. In this paper, we determine the ultimate sensitivity in the
estimation of any parameter when the information about this parameter is
encoded in such light, irrespective of the information extraction protocol used
in the estimation and of the measured observable. In addition we show that an
appropriate homodyne detection scheme allows us to reach this ultimate
sensitivity. We show that, for a given set of available quantum resources, the
most economical way to maximize the sensitivity is to put the most squeezed
state available in a well-de ned light mode. This implies that it is not
possible to take advantage of the existence of squeezed fluctuations in other
modes, nor of quantum correlations and entanglement between diff erent modes.

28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics