Time-Resolved Measurement of a Charge Qubit

We propose a scheme for monitoring coherent quantum dynamics with good time-resolution and low backaction, which relies on the response of the considered quantum system to high-frequency ac driving. An approximate analytical solution of the corresponding quantum master equation reveals that the phas...

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Bibliographic Details
Published inarXiv.org
Main Authors Reuther, Georg M, Zueco, David, Hänggi, Peter, Kohler, Sigmund
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 27.10.2008
Subjects
Exact solutions
Monitoring
Physics - Mesoscale and Nanoscale Physics
Physics - Quantum Physics
Physics - Superconductivity
Quantum theory
Qubits (quantum computing)
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Summary:We propose a scheme for monitoring coherent quantum dynamics with good time-resolution and low backaction, which relies on the response of the considered quantum system to high-frequency ac driving. An approximate analytical solution of the corresponding quantum master equation reveals that the phase of an outgoing signal, which can directly be measured in an experiment with lock-in technique, is proportional to the expectation value of a particular system observable. This result is corroborated by the numerical solution of the master equation for a charge qubit realized with a Cooper-pair box, where we focus on monitoring coherent oscillations.
ISSN:2331-8422
DOI:10.48550/arxiv.0806.2786