Exact dynamics of non-additive environments in non-Markovian open
quantum systems
- URL: http://arxiv.org/abs/2109.08442v1
- Date: Fri, 17 Sep 2021 10:08:37 GMT
- Title: Exact dynamics of non-additive environments in non-Markovian open
quantum systems
- Authors: Dominic Gribben, Dominic M. Rouse, Jake Iles-Smith, Aidan Strathearn,
Henry Maguire, Peter Kirton, Ahsan Nazir, Erik M. Gauger, and Brendon W.
Lovett
- Abstract summary: We present a numerically-exact and efficient technique for tackling the problem of capturing multi-bath system dynamics.
We test the method by applying it to a simple model system that exhibits non-additive behaviour.
We uncover a new regime where the quantum Zeno effect leads to a fully mixed state of the electronic system.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: When a quantum system couples strongly to multiple baths then it is generally
no longer possible to describe the resulting system dynamics by simply adding
the individual effects of each bath. However, capturing such multi-bath system
dynamics has up to now required approximations that can obscure some of the
non-additive effects. Here we present a numerically-exact and efficient
technique for tackling this problem that builds on the time-evolving matrix
product operator (TEMPO) representation. We test the method by applying it to a
simple model system that exhibits non-additive behaviour: a two-level dipole
coupled to both a vibrational and an optical bath. Although not directly
coupled, there is an effective interaction between the baths mediated by the
system that can lead to population inversion in the matter system when the
vibrational coupling is strong. We benchmark and validate multi-bath TEMPO
against two approximate methods - one based on a polaron transformation, the
other on an identification of a reaction coordinate - before exploring the
regime of simultaneously strong vibrational and optical coupling where the
approximate techniques break down. Here we uncover a new regime where the
quantum Zeno effect leads to a fully mixed state of the electronic system.
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