Hi Everyone,
This week, Dr. Joonsuk Huh will be giving group meeting. This is the
final group meeting to come at an unusual time - 3:30pm on Thursday in
the Division Room. Starting next week, all group meetings will occur
at 2pm on Thursday. An abstract and title for Joon's talk is included
below.
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Title: Multiconfigurational Quantum State Diffusion
Quantum transport of energy and charge are often described by
separating a system part of interest from environments and introducing
interactions between them, i.e. open quantum dynamics. The spin-boson
model is, in spite of the simple structure, notorious that it has no
analytic solution so far and the numerical solution becomes expensive
as the system and bath degrees of freedom (DOF) increase.
About 8 months ago, in the group meeting, Man Hong and I tried to
present linkages between two different approaches based on the
coherent state expansion for the bath DOF to complement each method
via the links. One is the multiconfigurational Ehrenfest method, which
is a time-dependent variational approach with a moving basis set
following the Ehrenfest trajectories. The other one is the quantum
state diffusion (QSD). QSD exploits an ensemble of a pure state
dynamics for the reduction of the bath DOF.
A few weeks ago, we had come up with a simple idea to combine the two
approaches such that a better numerical procedures for the spin-boson
model can be developed. In the group meeting, I will present the idea
with a little tutorial to the methods.
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--
Ryan Babbush | PhD Student in Physics
(949) 331-3943 | babbush(a)fas.harvard.edu
Harvard University | Aspuru-Guzik Group
12 Oxford Street | Cambridge, MA 02138
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