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Advances in Mathematical Physics
Volume 2010 (2010), Article ID 342915, 31 pages
doi:10.1155/2010/342915
Research Article

Dynamics of Entanglement between a Quantum Dot Spin Qubit and a Photon Qubit inside a Semiconductor High-Q Nanocavity

Hubert Pascal Seigneur,1 Gabriel Gonzalez,2,3 Michael Niklaus Leuenberger,2,3 and Winston Vaughan Schoenfeld1

1CREOL College of Optics and Photonics, University of Central Florida, Orlando, FL 32826, USA
2NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA
3Department of Physics, University of Central Florida, P. O. Box 162385, Orlando, FL 32816, USA

Received 15 September 2009; Accepted 24 November 2009

Academic Editor: Shao-Ming Fei

Copyright © 2010 Hubert Pascal Seigneur et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigate in this paper the dynamics of entanglement between a QD spin qubit and a single photon qubit inside a quantum network node, as well as its robustness against various decoherence processes. First, the entanglement dynamics is considered without decoherence. In the small detuning regime ( Δ = 7 8 𝜇 e V ), there are three different conditions for maximum entanglement, which occur after 71, 93, and 116 picoseconds of interaction time. In the large detuning regime ( Δ = 1 . 5 m e V ), there is only one peak for maximum entanglement occurring at 625 picoseconds. Second, the entanglement dynamics is considered with decoherence by including the effects of spin-nucleus and hole-nucleus hyperfine interactions. In the small detuning regime, a decent amount of entanglement (35% entanglement) can only be obtained within 200 picoseconds of interaction. Afterward, all entanglement is lost. In the large detuning regime, a smaller amount of entanglement is realized, namely, 25%. And, it lasts only within the first 300 picoseconds.