Quantum interference and phonon-mediated back-action in lateral quantum-dot circuits

Download
  1. Get@NRC: Quantum interference and phonon-mediated back-action in lateral quantum-dot circuits (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1038/nphys2326
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleNature Physics
ISSN1745-2473
1745-2481
Volume8
Issue7
Pages522527; # of pages: 6
AbstractSpin qubits have been successfully realized in electrostatically defined, lateral few-electron quantum-dot circuits. Qubit readout typically involves spin to charge information conversion, followed by a charge measurement made using a nearby biased quantum point contact (QPC). It is critical to understand the back-action disturbances resulting from such a measurement approach. Previous studies have indicated that QPC detectors emit phonons which are then absorbed by nearby qubits. We report here the observation of a pronounced back-action effect in multiple dot circuits, where the absorption of detector-generated phonons is strongly modified by a quantum interference effect, and show that the phenomenon is well described by a theory incorporating both the QPC and coherent phonon absorption. Our combined experimental and theoretical results suggest strategies to suppress back-action during the qubit readout procedure.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; Measurement Science and Standards; Information and Communication Technologies; Security and Disruptive Technologies
Peer reviewedYes
NPARC number21268925
Export citationExport as RIS
Report a correctionReport a correction
Record identifier233368d5-0387-4a2a-8587-7223352a8cbf
Record created2013-11-26
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)