Single charge detection of an electron created by a photon in a g-factor engineered quantum dot

Makoto Kuwahara, Takeshi Kutsuwa, Keiji Ono, Hideo Kosaka

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

We demonstrate that a single photoelectron can be trapped in a single quantum dot, which is formed by gate-defining with a nearly-zero g-factor quantum well, and a charge state can be detected with a quantum point contact without destruction. The detection yield has a peak of 0.27 at the resonant photon energy of the dot exciton in photon flux of 4.1× 10-10 W/ mm2. The number-resolved counting statistics revealed that the yield for the second electron trap is drastically decreased from that for the first trap because of the Coulomb-blockade effect. The demonstrated function is essential for making a high-fidelity quantum interface.

Original languageEnglish
Article number163107
JournalApplied Physics Letters
Volume96
Issue number16
DOIs
Publication statusPublished - 2010 Apr 19

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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