Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rapid State-Reduction of Quantum Systems Using Feedback Control   We consider using Hamiltonian feedback control to increase the speed at which
a continuous measurement purifies (reduces) the state of a quantum system, and
thus to increase the speed of the preparation of pure states. For a measurement
of an observable with N equispaced eigenvalues, we show that there exists a
feedback algorithm which will speed up the rate of state-reduction by at least
a factor of 2(N+1)/3.

10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph