Abstract
We demonstrate single-shot detection of single electrons generated by single photons using an electrically tunable quantum dot and a quantum point contact charge detector. By tuning the quantum dot in a Coulomb blockade before the photoexcitation, we observe the trapping and subsequent resetting of single photogenerated electrons. The photogenerated electrons can be stored in the dot for a tunable time range from shorter to longer than the spin-flip time . We combine this trap-reset technique with spin-dependent tunneling under magnetic fields to observe the spin-dependent photon detection within the .
- Received 27 September 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.146804
© 2011 American Physical Society
Synopsis
Early detection
Published 18 April 2011
Quick detection of photogenerated electrons in a quantum dot may lead to a better method to transfer quantum information between optical and electrical media.
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