Charge Qubit Purification by an Electronic Feedback Loop

Gerold Kießlich, Gernot Schaller, Clive Emary, and Tobias Brandes
Phys. Rev. Lett. 107, 050501 – Published 25 July 2011
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Abstract

We propose the manipulation of an isolated qubit by a simple instantaneous closed-loop feedback scheme in which a time-dependent electronic detector current is directly back-coupled into qubit parameters. As a specific detector model, we employ a capacitively coupled single-electron transistor. We demonstrate the stabilization of pure delocalized qubit states above a critical detector-qubit coupling. This electronic purification is independent of the initial qubit state and is accomplished after few electron jumps through the detector. Our simple scheme can be used for the efficient and robust initialization of solid-state qubits in quantum computational algorithms at arbitrary temperatures.

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  • Received 18 February 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.050501

© 2011 American Physical Society

Authors & Affiliations

Gerold Kießlich*, Gernot Schaller, Clive Emary, and Tobias Brandes

  • Institut für Theoretische Physik, Hardenbergstraße 36, Technische Universität Berlin, D-10623 Berlin, Germany

  • *gerold.kiesslich@tu-berlin.de

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Issue

Vol. 107, Iss. 5 — 29 July 2011

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