Title

Phonon decoherence of a double quantum dot charge qubit

Authors

Authors

S. Vorojtsov; E. R. Mucciolo;H. U. Baranger

Comments

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Abbreviated Journal Title

Phys. Rev. B

Keywords

COMPUTATION; TRANSPORT; Physics, Condensed Matter

Abstract

We study decoherence of a quantum dot charge qubit due to coupling to piezoelectric acoustic phonons in the Bom-Markov approximation. After including appropriate form factors, we find that phonon decoherence rates are one to two orders of magnitude weaker than was previously predicted. We calculate the dependence of the Q factor on lattice temperature, quantum dot size, and interdot coupling. Our results suggest that mechanisms other than phonon decoherence play a more significant role in current experimental setups.

Journal Title

Physical Review B

Volume

71

Issue/Number

20

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

7

WOS Identifier

WOS:000230244300071

ISSN

1098-0121

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