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The European Physical Journal B

Dynamics of a dissipative two level system

W. Zwerger

Published Mar 1, 1983• 77 citations
Publisher
DOI
10.1007/bf01578247

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We investigate the quantum dynamics of two-level systems (TLS) in glasses at low temperatures (1 K and below). We study an ensemble of TLSs coupled to phonons. By integrating out the phonons within the framework of the Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) master equation, we derive analytically the explicit form of the interactions among TLSs, and of the dissipation terms. We find that the unitary dynamics of the system shows clear signatures of many-body localization physics. We study numerically the time behavior of the concurrence, which measures pairwise entanglement also in nonisolated systems, and show that it presents a power-law decay both in the absence and in the presence of dissipation, if the latter is not too large. These features can be ascribed to the strong, long-tailed disorder characterizing the distributions of the model parameters. Our findings show that assuming ergodicity when discussing TLS physics might not be justified for all kinds of experiments on low-temperature glasses.