Carrega Matteo, Solinas Paolo, Sassetti Maura, Weiss Ulrich
SPIN-CNR, Via Dodecaneso 33, 16146 Genova, Italy.
Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy.
Phys Rev Lett. 2016 Jun 17;116(24):240403. doi: 10.1103/PhysRevLett.116.240403. Epub 2016 Jun 14.
The time-dependent energy transfer in a driven quantum system strongly coupled to a heat bath is studied within an influence functional approach. Exact formal expressions for the statistics of energy dissipation into the different channels are derived. The general method is applied to the driven dissipative two-state system. It is shown that the energy flows obey a balance relation, and that, for strong coupling, the interaction may constitute the major dissipative channel. Results in analytic form are presented for the particular value K=1/2 of strong Ohmic dissipation. The energy flows show interesting behaviors including driving-induced coherences and quantum stochastic resonances. It is found that the general characteristics persists for K near 1/2.
在影响泛函方法的框架内，研究了与热库强耦合的驱动量子系统中的时间相关能量转移。推导了进入不同通道的能量耗散统计的精确形式表达式。将该通用方法应用于驱动耗散二态系统。结果表明，能量流服从平衡关系，并且在强耦合情况下，相互作用可能构成主要的耗散通道。针对强欧姆耗散的特定值(K = 1/2)给出了解析形式的结果。能量流表现出有趣的行为，包括驱动诱导的相干性和量子随机共振。发现对于接近(1/2)的(K)，一般特征仍然存在。
