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- W4221159076 abstract "We study the long-time average of the reduced density matrix (RDM) of an $m$-level central system, which is locally coupled to a large environment, under an overall Schr{o}dinger evolution of the total system. We consider a class of interaction Hamiltonian, whose environmental part satisfies the so-called eigenstate thermalization hypothesis (ETH) ansatz with a constant diagonal part in the energy region concerned. On the eigenbasis of the central system's Hamiltonian, $frac{1}{2}(m-1)(m+2)$ relations among elements of the averaged RDM are derived. When steady states exist, these relations imply the existence of a preferred basis, given by a renormalized Hamiltonian that includes certain averaged impact of the system-environment interaction. Numerical simulations performed for a qubit coupled to a defect Ising chain conform the analytical predictions." @default.
- W4221159076 created "2022-04-03" @default.
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- W4221159076 date "2022-01-17" @default.
- W4221159076 modified "2023-10-16" @default.
- W4221159076 title "Preferred basis derived from eigenstate thermalization hypothesis" @default.
- W4221159076 hasPublicationYear "2022" @default.
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