Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Engineering of Quantum State by Time-Dependent Decoherence-Free
  Subspaces   We apply the time-dependent decoherence-free subspace theory to a Markovian
open quantum system in order to present a novel proposal for quantum-state
engineering program. By quantifying the purity of the quantum state, we verify
that the quantum-state engineering process designed via our method is
completely unitary within any total engineering time. Even though the controls
on the open quantum system are not perfect, the asymptotic purity is still
robust. Owing to its ability to completely resist decoherence and the lack of
restraint in terms of the total engineering time, our proposal is suitable for
multitask quantum-state engineering program. Therefore, this proposal is not
only useful for achieving the quantum-state engineering program experimentally,
it also helps us build both a quantum simulation and quantum information
equipment in reality.

11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
3
The categories of this paper are: physics