Decoherence of charge qubit coupled to interacting background charges

Igor Yurkevich, Jim Baldwin, Igor V. Lerner, Boris L. Altshuler

Research output: Contribution to journalArticle

Abstract

The major contribution to decoherence of a double quantum dot or a Josephson-junction charge qubit comes from the electrostatic coupling to fluctuating background charges hybridized with the conduction electrons in the reservoir. However, estimations according to previously developed theories show that finding a sufficient number of effective fluctuators in a realistic experimental layout is quite improbable. We show that this paradox is resolved by allowing for a short-range Coulomb interaction of the fluctuators with the electrons in the reservoir. This dramatically enhances both the number of effective fluctuators and their contribution to decoherence, resulting in the most dangerous decoherence mechanism for charge qubits.
Original languageEnglish
Article number121305
Number of pages12
JournalPhysical Review B
Volume81
Issue number12
DOIs
Publication statusPublished - 15 Mar 2010

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Electrons
paradoxes
Coulomb interactions
conduction electrons
Josephson junctions
layouts
Semiconductor quantum dots
Electrostatics
quantum dots
electrostatics
electrons
interactions

Bibliographical note

© 2010 The American Physical Society

Cite this

Yurkevich, Igor ; Baldwin, Jim ; Lerner, Igor V. ; Altshuler, Boris L. / Decoherence of charge qubit coupled to interacting background charges. In: Physical Review B. 2010 ; Vol. 81, No. 12.
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Decoherence of charge qubit coupled to interacting background charges. / Yurkevich, Igor; Baldwin, Jim; Lerner, Igor V.; Altshuler, Boris L.

In: Physical Review B, Vol. 81, No. 12, 121305, 15.03.2010.

Research output: Contribution to journalArticle

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