Coherent Feedback Control in Quantum Transport

Clive Emary, John Gough

Research output: Contribution to journalArticlepeer-review

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Abstract

We discuss control of the quantum-transport properties of a mesoscopic device by connecting it in a coherent feedback loop with a quantum-mechanical controller. We work in a scattering approach and derive results for the combined scattering matrix of the device-controller system and determine the conditions under which the controller can exert ideal control on the output characteristics. As concrete example we consider the use of feedback to optimise the conductance of a chaotic quantum dot and investigate effects of controller dimension and decoherence. In both respects we find that the performance of the feedback geometry is well in excess of that offered by a simple series configuration.
Original languageEnglish
Article number205436
Number of pages8
JournalPhysical Review B
Volume90
DOIs
Publication statusPublished - 26 Nov 2014

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