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Single-Shot Detection of Electrons Generated by Individual Photons in a Tunable Lateral Quantum Dot

A. Pioda, E. Totoki, H. Kiyama, T. Fujita, G. Allison, T. Asayama, A. Oiwa, and S. Tarucha
Phys. Rev. Lett. 106, 146804 – Published 8 April 2011
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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 T1. We combine this trap-reset technique with spin-dependent tunneling under magnetic fields to observe the spin-dependent photon detection within the T1.

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  • Received 27 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.146804

© 2011 American Physical Society

Synopsis

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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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Authors & Affiliations

A. Pioda1, E. Totoki1, H. Kiyama1, T. Fujita1, G. Allison1,2, T. Asayama1,3, A. Oiwa1,*, and S. Tarucha1

  • 1Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 2Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
  • 3Advanced Materials Laboratories, SONY Corporation, 4-16-1 Okata, Atsugi, Kanagawa 243-0021, Japan

  • *oiwa@ap.t.u-tokyo.ac.jp

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Issue

Vol. 106, Iss. 14 — 8 April 2011

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