Time-optimal performance of Josephson charge qubits: A process tomography approach

A process tomography based optimization scheme for open quantum systems is used to determine the performance limits of Josephson charge qubits within current experimental means. The qubit is modeled microscopically as an open quantum system taking into account state leakage, as well as environment-i...

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Bibliographic Details
Published in:arXiv.org 2009-06
Main Authors: Roloff, Robert, Pötz, Walter
Format: Article
Language:English
Subjects:
Control theory
Leakage
Noise control
Noise spectra
Optimal control
Optimization
Quantum theory
Qubits (quantum computing)
Time optimal control
Tomography
Online Access:Get full text
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Summary:A process tomography based optimization scheme for open quantum systems is used to determine the performance limits of Josephson charge qubits within current experimental means. The qubit is modeled microscopically as an open quantum system taking into account state leakage, as well as environment-induced dephasing based on experimental noise spectra. Within time-optimal control theory, we show that the competing requirements for suppression of state leakage and dephasing can be met by an external control of the effective qubit-environment interaction, yielding minimal gate fidelity losses of around \(\Delta F \approx 10^{-3}\) under typical experimental conditions.
ISSN:2331-8422
DOI:10.48550/arxiv.0906.3294