Optical control of entangled states in semiconductor quantum wells

E. Räsänen, T. Blasi, M. F. Borunda, and E. J. Heller
Phys. Rev. B 86, 205308 – Published 8 November 2012
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Abstract

We present theory and calculations for coherent high-fidelity quantum control of many-particle states in semiconductor quantum wells. We show that coupling a two-electron double quantum dot to a terahertz optical source enables targeted excitations that are one to two orders of magnitude faster and significantly more accurate than those obtained with electric gates. The optical fields subject to physical constraints are obtained through quantum optimal control theory that we apply in conjunction with the numerically exact solution of the time-dependent Schrödinger equation. Our ability to coherently control arbitrary two-electron states, and to maximize the entanglement, opens up further perspectives in solid-state quantum information.

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  • Received 17 May 2012

DOI:https://doi.org/10.1103/PhysRevB.86.205308

©2012 American Physical Society

Authors & Affiliations

E. Räsänen1,2,3,*, T. Blasi3,4, M. F. Borunda3,5, and E. J. Heller3,6

  • 1Department of Physics, Tampere University of Technology, FI-33101 Tampere, Finland
  • 2Nanoscience Center, Department of Physics, University of Jyväskylä, FI-40014 Jyväskylä, Finland
  • 3Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA
  • 4Physik Department, Technische Universität München, D-85747 Garching, Germany
  • 5Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA
  • 6Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA

  • *esa.rasanen@tut.fi

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Issue

Vol. 86, Iss. 20 — 15 November 2012

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