Quantum Decoherence and Thermalization at Finite Temperatures of Non-Degenerate Spin Systems via Small Spin Environments

[摘要] We study the case of a small quantum spin system S with a non-degenerate groundstate coupled to a small quantum spin bath. Finite temperature measures for both quantum decoherence and thermalization are studied. The computational results, obtained from exact diagonalization, compare well with a recent perturbation theory prediction, even when the system and bath are of comparable sizes.

[发布机构] Dept. of Physics and Astronomy, HPC2 Center for Computational Sciences, Mississippi State U., Mississippi State; MS; 39762, United States^1;Institute for Advanced Simulation, Jülich Supercomputing Centre, Forschungszentrum Jülich, Jülich; D-52425, Germany^2;Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, AG Groningen; NL-9747, Netherlands^3;RWTH Aachen University, Aachen; D-52056, Germany^4

[效力级别] 计算机科学 [学科分类] 计算机科学（综合）

[关键词] Computational results;Exact diagonalization;Finite temperatures;Perturbation theory;Quantum decoherence;Quantum spin systems;Spin systems;Thermalization