Charge Qubit Purification by an Electronic Feedback Loop

Details Charge Qubit Purification by an Electronic Feedback Loop Charge Qubit Purification by an Electronic Feedback Loop

2011-02-18

arxiv.org/abs/1102.3771v2

Phys. Rev. Lett. 107, 050501 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, supplementary material, with minor modifications to be published by PRL

Scientific paper

10.1103/PhysRevLett.107.050501

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 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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