报告题目: |
Crossover Between Mon-Markovian and Markov Dynamics Induced by a Structured Environment |
报告人: |
Ting Yu |
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Department of Physics and Engineering Physics
Stevens Institute of Technology, New Jersey, USA
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报告时间: |
2014-07-09 09:00 |
报告地点: |
理科楼三楼报告厅 |
主办单位: |
物理系 |
简介: |
In this talk I will report our recent work on the crossover between non-Markovian
and Markov dynamics induced by a hierarchical environment. It is known that
non-Markovian evolution of an open quantum system can be induced by the memory
effects of a reservoir. Although a reservoir with stronger memory effects may seem
like it should cause stronger non-Markovian effects on the system of interest, this
seemingly intuitive thinking may not always be correct. We illustrate this by investigating
a qubit (a two-level atom) that is coupled to a hierarchical environment, which contains
a single-mode cavity and a reservoir consisting of infinite numbers of modes. We show
how the non-Markovian character of the system is influenced by the coupling strength
between the qubit and cavity and the correlation time of the reservoir. In particular, we
found a new phenomenon whereby the qubit Markovian and non-Markovian transition
exhibits a anomalous pattern in a parameter space depicted by the coupling strength
and the correlation time of the reservoir.
In addition, I will report some recent work on the stochastic Schroedinger equations
for the dynamics of an open quantum system coupled to a reservoir consisting of a finite
or infinite number of bosons (or fermions).
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