Environment-Assisted Quantum Transport

Details Environment-Assisted Quantum Transport Environment-Assisted Quantum Transport

2008-07-07

arxiv.org/abs/0807.0929v2

New J. Phys. 11, 033003 (2009)

Physics

Quantum Physics

7 pages, 3 figures, improved presentation, to appear in New Journal of Physics

Scientific paper

10.1088/1367-2630/11/3/033003

Transport phenomena at the nanoscale are of interest due to the presence of both quantum and classical behavior. In this work, we demonstrate that quantum transport efficiency can be enhanced by a dynamical interplay of the system Hamiltonian with pure dephasing induced by a fluctuating environment. This is in contrast to fully coherent hopping that leads to localization in disordered systems, and to highly incoherent transfer that is eventually suppressed by the quantum Zeno effect. We study these phenomena in the Fenna-Matthews-Olson protein complex as a prototype for larger photosynthetic energy transfer systems. We also show that disordered binary tree structures exhibit enhanced transport in the presence of dephasing.

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