Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct measurement of the quantum state of photons in a cavity   We propose a scheme to measure the quantum state of photons in a cavity. The
proposal is based on the concept of quantum weak values and applies equally
well to both the solid-state circuit and atomic cavity quantum electrodynamics
(QED) systems. The proposed scheme allows us to access directly the
superposition components in Fock state basis, rather than the Wigner function
as usual in phase space. Moreover, the separate access feature held in the
direct scheme does not require a global reconstruction for the quantum state,
which provides a particular advantage beyond the conventional method of quantum
state tomography.

22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin