Telegraph Noise in Coupled Quantum Dot Circuits Induced by a Quantum Point Contact

D. Taubert, M. Pioro-Ladrière, D. Schröer, D. Harbusch, A.  S. Sachrajda, and S. Ludwig
Phys. Rev. Lett. 100, 176805 – Published 2 May 2008

Abstract

Charge detection utilizing a highly biased quantum point contact has become the most effective probe for studying few electron quantum dot circuits. Measurements on double and triple quantum dot circuits is performed to clarify a back action role of charge sensing on the confined electrons. The quantum point contact triggers inelastic transitions, which occur quite generally. Under specific device and measurement conditions these transitions manifest themselves as bounded regimes of telegraph noise within a stability diagram. A nonequilibrium transition from artificial atomic to molecular behavior is identified. Consequences for quantum information applications are discussed.

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  • Received 25 January 2008

DOI:https://doi.org/10.1103/PhysRevLett.100.176805

©2008 American Physical Society

Authors & Affiliations

D. Taubert1, M. Pioro-Ladrière2, D. Schröer1, D. Harbusch1, A.  S. Sachrajda3, and S. Ludwig1

  • 1Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, D-80539 München, Germany
  • 2Quantum Spin Information Project, ICORP, Japan Science and Technology Agency, Atsugi-shi, 243-0198, Japan
  • 3Institute For Microstructural Sciences, NRC, Ottawa, K1A 0R6, Canada

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Issue

Vol. 100, Iss. 17 — 2 May 2008

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