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.
Original language | English |
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Article number | 156801 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 102 |
Issue number | 15 |
DOIs | |
Publication status | Published - 17 Apr 2009 |
Keywords
- surface acoustic waves
- quantum dots
- computation
- channel
- states
- spin