Raman phonon emission in a driven double quantum dot

Colless, J. I., Croot, X. G., Stace, T.M., Doherty, A.C., Barrett, S. D., Lu, H., Gossard, A. C. and Reilly, D. J. (2014) Raman phonon emission in a driven double quantum dot. Nature Communications, 5 . doi:10.1038/ncomms4716

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Author Colless, J. I.
Croot, X. G.
Stace, T.M.
Doherty, A.C.
Barrett, S. D.
Lu, H.
Gossard, A. C.
Reilly, D. J.
Title Raman phonon emission in a driven double quantum dot
Journal name Nature Communications   Check publisher's open access policy
ISSN 2041-1723
Publication date 2014-04-23
Year available 2014
Sub-type Article (original research)
DOI 10.1038/ncomms4716
Open Access Status File (Publisher version)
Volume 5
Total pages 6
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2015
Language eng
Abstract The compound semiconductor gallium-arsenide (GaAs) provides an ultra-clean platform for storing and manipulating quantum information, encoded in the charge or spin states of electrons confined in nanostructures. The absence of inversion symmetry in the zinc-blende crystal structure of GaAs however, results in a strong piezoelectric interaction between lattice acoustic phonons and qubit states with an electric dipole, a potential source of decoherence during charge-sensitive operations. Here we report phonon generation in a GaAs double quantum dot, configured as a single- or two-electron charge qubit, and driven by the application of microwaves via surface gates. In a process that is a microwave analogue of the Raman effect, phonon emission produces population inversion of the two-level system and leads to rapid decoherence of the qubit when the microwave energy exceeds the level splitting. Comparing data with a theoretical model suggests that phonon emission is a sensitive function of the device geometry.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2015 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 6 times in Scopus Article | Citations
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