Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Fisher information of entangled coherent state in the presence
  of photon losses: exact solution   We investigate the performance of entangled coherent state for quantum
enhanced phase estimation. An exact analytical expression of quantum Fisher
information is derived to show the role of photon losses on the ultimate phase
sensitivity. We find a transition of the sensitivity from the Heisenberg
scaling to the classical scaling due to quantum decoherence of the photon
state. This quantum-classical transition is uniquely determined by the number
of photons being lost, instead of the number of incident photons or the photon
loss rate alone. Our results also reveal that a crossover of the sensitivity
between the entangled coherent state and the NOON state can occur even for very
small photon loss rate.

12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int