Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Emergence of Quantum-Classical Dynamics in an Open Quantum Environment   The conditions under which an open quantum mechanical system may be described
by mixed quantum-classical dynamics are investigated. Decoherence is studied
using influence functional methods in a model composite quantum system
comprising two coupled systems, A and C, interacting with a harmonic bath with
Ohmic and super-Ohmic spectral densities. Subsystem A is directly coupled to
subsystem C, while C is coupled directly to the bath. Calculations are
presented for a model where subsystem A is taken to be a two-level system which
is bilinearly coupled to a single harmonic oscillator C subsystem. The loss of
quantum coherence in each subsystem is discussed in the extreme non-adiabatic
regime where the dynamics of subsystem A is essentially frozen. Subsystem C is
shown to lose its coherence rapidly, while subsystem A maintains coherence for
longer time periods since C modulates the influence of the bath on A. Thus, one
may identify situations where the coupled AC system evolution effectively obeys
mixed quantum-classical dynamics.

16
The categories of this paper are: stat
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat