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Entanglement in Open Quantum Systems

100%
Buchleitner A., Carvalho A., Mintert F.
Acta Physica Polonica A
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2007
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vol. 112
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issue 4
575-588
EN
We give a compact review of some of our recent results on the quantification, the measurement, and the time evolution of entanglement in open quantum systems of variable structure and dimension. Also a first experimental implementation is briefly discussed.
2
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Disorder-Assisted Exciton Transport

100%
Scholak T., Zech T., Wellens T., Buchleitner A.
Acta Physica Polonica A
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2011
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vol. 120
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issue 6A
A-89-A-94
EN
We discuss the possibly constructive role of disorder for the optimization of exciton transport in the FMO (Fenna-Matthews-Olson) light harvesting complex. Our analysis, which models the FMO as a 3D random graph, demonstrates the existence of a small fraction of optimal, though highly asymmetric, non-periodic conformations, which yield near-to-optimal coherent excitation transport. We argue that, on transient time scales, such quantum interference enhanced transport does always better than stochastic activation.
3
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Chaos Assisted Tunneling and Nonspreading Wave Packets

100%
Zakrzewski J., Delande D., Buchleitner A.
Acta Physica Polonica A
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1998
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vol. 93
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issue 1
179-186
EN
Consider an initial state lying on a primary resonance island. The state may tunnel into the chaotic sea surrounding it and further escape to infinity via chaotic diffusion. Properties of transport in such a situation are studied on an exemplary system - the hydrogen atom driven by microwaves. We show that the combination of tunneling followed by chaotic diffusion leads to peculiar large scale fluctuations of the AC Stark shift and ionization rates. An appropriate random matrix model describes accurately these statistical properties.
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