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Coherent Time Evolution of a Single-Electron Wave Function

Kataoka, M; Astley, MR; Thorn, AL; Oi, DKL; Barnes, CHW; Ford, CJB; Anderson, D; (2009) Coherent Time Evolution of a Single-Electron Wave Function. PHYS REV LETT , 102 (15) , Article 156801. 10.1103/PhysRevLett.102.156801. Green open access

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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.

Type: Article
Title: Coherent Time Evolution of a Single-Electron Wave Function
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.102.156801
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.102.156801
Language: English
Additional information: © 2009 The American Physical Society
Keywords: SURFACE ACOUSTIC-WAVES, QUANTUM DOTS, COMPUTATION, CHANNEL, STATES, SPIN
UCL classification: UCL > School of BEAMS > Faculty of Engineering Science
UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/1314521
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