Nonadiabatic quantum control of a semiconductor charge qubit

Y. Dovzhenko, J. Stehlik, K. D. Petersson, J. R. Petta, H. Lu, A. C. Gossard

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

We demonstrate multipulse quantum control of a single electron charge qubit. The qubit is manipulated by applying nonadiabatic voltage pulses to a surface depletion gate and readout is achieved using a quantum point-contact charge sensor. We observe Ramsey fringes in the excited-state occupation in response to a π/2-π/2 pulse sequence and extract T2*∼60 ps away from the charge degeneracy point. Simulations suggest these results may be extended to implement a charge echo by reducing the interdot tunnel coupling and pulse rise time, thereby increasing the nonadiabaticity of the pulses.

Original languageEnglish (US)
Article number161302
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number16
DOIs
StatePublished - Oct 7 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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