Title

Decoherence by electromagnetic fluctuations in double-quantum-dot charge qubits

Authors

Authors

D. C. B. Valente; E. R. Mucciolo;F. K. Wilhelm

Comments

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Abbreviated Journal Title

Phys. Rev. B

Keywords

OSCILLATIONS; SPIN; Physics, Condensed Matter

Abstract

We discuss decoherence due to electromagnetic fluctuations in charge qubits formed by two lateral quantum dots. We use effective circuit model to evaluate correlations of voltage fluctuations in the qubit setup. These correlations allows us to estimate energy (T(1)) and phase (T(2)) relaxation times of the qubit system. Our theoretical estimate of the quality factor due to dephasing by electromagnetic fluctuations yields values much higher than those found in recent experiments, indicating that other sources of decoherence play a dominant role.

Journal Title

Physical Review B

Volume

82

Issue/Number

12

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

12

WOS Identifier

WOS:000281516500007

ISSN

1098-0121

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