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arXiv 0812.1096quant-ph
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量子布朗运动的非马尔可夫弱耦合极限

Non-Markovian weak coupling limit of quantum Brownian motion

Sabrina Maniscalco, Jyrki Piilo, Kalle-Antti Suominen

摘要:

我们推导并解析求解了谐振子布朗运动的非马尔可夫主方程,证明了对于弱的系统-储层耦合和高温,它可以被改写成谐振子与压缩热浴相互作用的主方程的形式。这种等价性保证了在时间演化过程中密度算符的正性保持不变,并允许人们在压缩环境中薛定谔猫态的动力学和量子布朗运动中环境诱导的退相干之间建立联系。

英文摘要:

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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