Abstract
We derive and solve analytically the non-Markovian master equation for harmonic quantum Brownian motion proving that, for weak system-reservoir couplings and high temperatures, it can be recast in the form of the master equation for a harmonic oscillator interacting with a squeezed thermal bath. This equivalence guarantees preservation of positivity of the density operator during the time evolution and allows one to establish a connection between the dynamics of Schrödinger cat states in squeezed environments and environment-induced decoherence in quantum Brownian motion.
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Maniscalco, S., Piilo, J. & Suominen, KA. Non-Markovian weak coupling limit of quantum Brownian motion. Eur. Phys. J. D 55, 181–187 (2009). https://doi.org/10.1140/epjd/e2009-00230-6
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DOI: https://doi.org/10.1140/epjd/e2009-00230-6