Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Partition-free approach to open quantum systems in harmonic
  environments: an exact stochastic Liouville equation   We present a partition-free approach to the evolution of density matrices for
open quantum systems coupled to a harmonic environment. The influence
functional formalism combined with a two-time Hubbard-Stratonovich
transformation allows us to derive a set of exact differential equations for
the reduced density matrix of an open system, termed the Extended Stochastic
Liouville-von Neumann equation. Our approach generalises previous work based on
Caldeira-Leggett models and a partitioned initial density matrix. This provides
a simple, yet exact, closed-form description for the evolution of open systems
from equilibriated initial conditions. The applicability of this model and the
potential for numerical implementations are also discussed.

22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin