Coherent time evolution of a single-electron wave function

M. Kataoka, M.R. Astley, A.L. Thorn, D.K.L. Oi, C.H.W. Barnes, C.J.B. Ford, D. Anderson, G.A.C. Jones, I. Farrer, D.A. Ritchie, M. Pepper

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Observation of coherent single-electron dynamics is severely limited by experimental bandwidth. We present a method to overcome this using moving quantum dots defined by surface acoustic waves. Each dot holds a single electron, and travels through a static potential landscape. When the dot passes abruptly between regions of different confinement, the electron is excited into a superposition of states, and oscillates unitarily from side to side. We detect these oscillations by using a weak, repeated measurement of the current across a tunnel barrier, and find close agreement with simulations.
LanguageEnglish
Article number156801
Number of pages4
JournalPhysical Review Letters
Volume102
Issue number15
DOIs
Publication statusPublished - 17 Apr 2009

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wave functions
electrons
travel
tunnels
quantum dots
bandwidth
oscillations
acoustics
simulation

Keywords

  • surface acoustic waves
  • quantum dots
  • computation
  • channel
  • states
  • spin

Cite this

Kataoka, M., Astley, M. R., Thorn, A. L., Oi, D. K. L., Barnes, C. H. W., Ford, C. J. B., ... Pepper, M. (2009). Coherent time evolution of a single-electron wave function. Physical Review Letters, 102(15), [156801 ]. https://doi.org/10.1103/PhysRevLett.102.156801
Kataoka, M. ; Astley, M.R. ; Thorn, A.L. ; Oi, D.K.L. ; Barnes, C.H.W. ; Ford, C.J.B. ; Anderson, D. ; Jones, G.A.C. ; Farrer, I. ; Ritchie, D.A. ; Pepper, M. / Coherent time evolution of a single-electron wave function. In: Physical Review Letters. 2009 ; Vol. 102, No. 15.
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Kataoka, M, Astley, MR, Thorn, AL, Oi, DKL, Barnes, CHW, Ford, CJB, Anderson, D, Jones, GAC, Farrer, I, Ritchie, DA & Pepper, M 2009, 'Coherent time evolution of a single-electron wave function' Physical Review Letters, vol. 102, no. 15, 156801 . https://doi.org/10.1103/PhysRevLett.102.156801

Coherent time evolution of a single-electron wave function. / Kataoka, M.; Astley, M.R.; Thorn, A.L.; Oi, D.K.L.; Barnes, C.H.W.; Ford, C.J.B.; Anderson, D.; Jones, G.A.C.; Farrer, I.; Ritchie, D.A.; Pepper, M.

In: Physical Review Letters, Vol. 102, No. 15, 156801 , 17.04.2009.

Research output: Contribution to journalArticle

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AU - Kataoka, M.

AU - Astley, M.R.

AU - Thorn, A.L.

AU - Oi, D.K.L.

AU - Barnes, C.H.W.

AU - Ford, C.J.B.

AU - Anderson, D.

AU - Jones, G.A.C.

AU - Farrer, I.

AU - Ritchie, D.A.

AU - Pepper, M.

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AB - Observation of coherent single-electron dynamics is severely limited by experimental bandwidth. We present a method to overcome this using moving quantum dots defined by surface acoustic waves. Each dot holds a single electron, and travels through a static potential landscape. When the dot passes abruptly between regions of different confinement, the electron is excited into a superposition of states, and oscillates unitarily from side to side. We detect these oscillations by using a weak, repeated measurement of the current across a tunnel barrier, and find close agreement with simulations.

KW - surface acoustic waves

KW - quantum dots

KW - computation

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KW - states

KW - spin

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Kataoka M, Astley MR, Thorn AL, Oi DKL, Barnes CHW, Ford CJB et al. Coherent time evolution of a single-electron wave function. Physical Review Letters. 2009 Apr 17;102(15). 156801 . https://doi.org/10.1103/PhysRevLett.102.156801