This title appears in the Scientific Report :
2016
Please use the identifier:
http://hdl.handle.net/2128/9974 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevA.93.032110 in citations.
Quantum decoherence and thermalization at finite temperature within the canonical-thermal-state ensemble
Quantum decoherence and thermalization at finite temperature within the canonical-thermal-state ensemble
We study measures of decoherence and thermalization of a quantum system S in the presence of a quantum environment (bath) E. The entirety S+E is prepared in a canonical-thermal state at a finite temperature; that is, the entirety is in a steady state. Both our numerical results and theoretical predi...
Saved in:
Personal Name(s): | Novotny, M. A. (Corresponding author) |
---|---|
Jin, F. / Yuan, S. / Miyashita, S. / De Raedt, H. / Michielsen, K. | |
Contributing Institute: |
Jülich Supercomputing Center; JSC JARA - HPC; JARA-HPC |
Published in: | Physical Review A Physical review / A, 93 93 (2016 2016) 3 3, S. 032110 032110 |
Imprint: |
College Park, Md.
APS
2016
2016-03-07 2016-03-01 |
DOI: |
10.1103/PhysRevA.93.032110 |
Document Type: |
Journal Article |
Research Program: |
Manipulation and dynamics of quantum spin systems Computational Science and Mathematical Methods |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevA.93.032110 in citations.
We study measures of decoherence and thermalization of a quantum system S in the presence of a quantum environment (bath) E. The entirety S+E is prepared in a canonical-thermal state at a finite temperature; that is, the entirety is in a steady state. Both our numerical results and theoretical predictions show that measures of the decoherence and the thermalization of S are generally finite, even in the thermodynamic limit, when the entirety S+E is at finite temperature. Notably, applying perturbation theory with respect to the system-environment coupling strength, we find that under common Hamiltonian symmetries, up to first order in the coupling strength it is sufficient to consider S uncoupled from E, but entangled with E, to predict decoherence and thermalization measures of S. This decoupling allows closed-form expressions for perturbative expansions for the measures of decoherence and thermalization in terms of the free energies of S and of E. Large-scale numerical results for both coupled and uncoupled entireties with up to 40 quantum spins support these findings. |