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000283596 1001_ $$0P:(DE-HGF)0$$aNovotny, M. A.$$b0$$eCorresponding author
000283596 245__ $$aQuantum decoherence and thermalization at finite temperature within the canonical-thermal-state ensemble
000283596 260__ $$aCollege Park, Md.$$bAPS$$c2016
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000283596 520__ $$aWe study measures of decoherence and thermalization of a quantum system S in the presence of a quantum environment (bath) E. The entirety S+E is prepared in a canonical-thermal state at a finite temperature; that is, the entirety is in a steady state. Both our numerical results and theoretical predictions show that measures of the decoherence and the thermalization of S are generally finite, even in the thermodynamic limit, when the entirety S+E is at finite temperature. Notably, applying perturbation theory with respect to the system-environment coupling strength, we find that under common Hamiltonian symmetries, up to first order in the coupling strength it is sufficient to consider S uncoupled from E, but entangled with E, to predict decoherence and thermalization measures of S. This decoupling allows closed-form expressions for perturbative expansions for the measures of decoherence and thermalization in terms of the free energies of S and of E. Large-scale numerical results for both coupled and uncoupled entireties with up to 40 quantum spins support these findings.
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000283596 536__ $$0G:(DE-Juel1)jjsc09_20120501$$aManipulation and dynamics of quantum spin systems (jjsc09_20120501)$$cjjsc09_20120501$$fManipulation and dynamics of quantum spin systems$$x1
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000283596 7001_ $$0P:(DE-Juel1)138295$$aMichielsen, K.$$b5$$ufzj
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000283596 773__ $$0PERI:(DE-600)2844156-4$$a10.1103/PhysRevA.93.032110$$gVol. 93, no. 3, p. 032110$$n3$$p032110$$tPhysical review / A$$v93$$x2469-9926$$y2016
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