Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum nondemolition measurement of the Werner state   We propose a theoretical scheme of quantum nondemolition measurement of
two-qubit Werner state. We discuss our scheme with the two qubits restricted in
a local place and then extend the scheme to the case in which two qubits are
separated. We also consider the experimental realization of our scheme based on
cavity quantum electrodynamics. It is very interesting that our scheme is
robust against the dissipative effects introduced by the probe process. We also
give a brief interpretation of our scheme finally.

10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
16
The categories of this paper are: stat
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an