Persistence of coherent quantum dynamics at strong dissipation.
Persistence of coherent quantum dynamics at strong dissipation.
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DOI：
10.1103/physrevlett.110.010402
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发表时间：
2012-04
影响因子：
8.6
通讯作者：
D. Kast;J. Ankerhold
中科院分区：
文献类型：
--
作者：
D. Kast;J. Ankerhold
研究了具有亚欧姆谱密度的玻色子库耦合的双态系统在强摩擦下的量子动力学。数值精确路径积分蒙特卡罗方法揭示了从相干到非相干松弛的转变不会发生在广泛的光谱分布中。在非平衡态中，当强耗散迫使系统的热力学状态几乎符合经典时，与系统-储层纠缠相关的相干仍然存在。这可能与当前纳米级器件的实验相关。
The quantum dynamics of a two-state system coupled to a bosonic reservoir with sub-Ohmic spectral density is investigated for strong friction. Numerically exact path integral Monte Carlo methods reveal that a changeover from coherent to incoherent relaxation does not occur for a broad class of spectral distributions. In nonequilibrium coherences associated with substantial system-reservoir entanglement exist even when strong dissipation forces the thermodynamic state of the system to behave almost classically. This may be of relevance for current experiments with nanoscale devices.