Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental demonstration of phase estimation advantage in presence of
  depolarizing noise by using coherent measurements   We report an experimental investigation of the role of measurement in quantum
metrology when the states of the probes are mixed. In particular, we
investigated optimized local measurements and general global projective
measurements, involving entangling operations, on noisy Werner states of
polarization entangled photons. We demonstrate experimentally that global
measurement presents an advantage in parameter estimation with respect to the
optimized local strategy. Moreover, the global strategy provides unambiguous
information about the parameter of interest even when the amount of noise is
not well characterized. This shows that the coherence in quantum operations,
such as the Bell-state projection device used in our protocol, can be used to
further boost the quantum advantage in metrology and play a fundamental role in
the design of future quantum measurement devices.

7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat