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Conditioned spin and charge dynamics of a single-electron quantum dot

Eliska Greplova, Edward A. Laird, G. Andrew D. Briggs, and Klaus Mølmer
Phys. Rev. A 96, 052104 – Published 7 November 2017

Abstract

In this article we describe the incoherent and coherent spin and charge dynamics of a single-electron quantum dot. We use a stochastic master equation to model the state of the system, as inferred by an observer with access to only the current signal through a quantum point contact, acting as a charge sensor. Measurements obtained during an interval of time contribute, by a past quantum state analysis, to our knowledge about the system at any time t within that interval. Such analysis permits precise estimation of physical parameters and we propose and test a modification of the classical Baum-Welch parameter reestimation method to systems driven by both coherent and incoherent processes.

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  • Received 22 August 2017

DOI:https://doi.org/10.1103/PhysRevA.96.052104

©2017 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & OpticalGeneral PhysicsCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Eliska Greplova1, Edward A. Laird2, G. Andrew D. Briggs2, and Klaus Mølmer1

  • 1Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
  • 2Department of Materials, Oxford University, Oxford OX1 2JD, United Kingdom

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Issue

Vol. 96, Iss. 5 — November 2017

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