Dephasing-assisted transport in linear triple quantum dots

Environmental noise usually hinders the efficiency of charge transport through coherent quantum systems; an exception is dephasing-assisted transport (DAT). We show that linear triple quantum dots in a transport configuration and subjected to pure dephasing exhibit DAT if the coupling to the drain r...

Full description

Saved in:
Bibliographic Details
Published in:New journal of physics 2014-11, Vol.16 (11), p.113061-20
Main Authors: Contreras-Pulido, L D, Bruderer, M, Huelga, S F, Plenio, M B
Format: Article
Language:English
Subjects:
Background noise
Charge efficiency
Charge transport
Coupling
Density
dephasing-assisted transport
Drains
full counting statistics
Joining
long-distance tunnelling
mesoscopic physics
Physics
Polynomials
Quantum dots
quantum transport
quantum Zeno effect
Reduction
Shot noise
Statistics
Transport
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Environmental noise usually hinders the efficiency of charge transport through coherent quantum systems; an exception is dephasing-assisted transport (DAT). We show that linear triple quantum dots in a transport configuration and subjected to pure dephasing exhibit DAT if the coupling to the drain reservoir exceeds a threshold. DAT occurs for arbitrarily weak dephasing and the enhancement can be directly controlled by the coupling to the drain. Moreover, for specific settings, the enhanced current is accompanied by a reduction of the relative shot noise. We identify the quantum Zeno effect and long-distance tunnelling as underlying dynamic processes involved in dephasing-assisted and -suppressed transport. Our analytical results are obtained by using the density matrix formalism and the characteristic polynomial approach to full counting statistics.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/16/11/113061