Dephasing-assisted transport in linear triple quantum dots

作者：Contreras Pulido L D^*; Bruderer M; Huelga S F; Plenio M B

来源：New Journal of Physics, 2014, 16(11): 113061.

DOI：10.1088/1367-2630/16/11/113061

• quantum dots
• quantum transport
• dephasing-assisted transport
• long-distance tunnelling
• quantum Zeno effect
• mesoscopic physics
• full counting statistics

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.

• 出版日期2014-11-24