Controlling entanglement by direct quantum feedback

A. R. R. Carvalho, A. J. S. Reid, and J. J. Hope

Phys. Rev. A 78, 012334 – Published 18 July 2008

Abstract

We discuss the generation of entanglement between electronic states of two atoms in a cavity using direct quantum feedback schemes. We compare the effects of different control Hamiltonians and detection processes in the performance of entanglement production and show that the quantum-jump-based feedback proposed by Carvalho and Hope [Phys. Rev. A 76, 010301(R) (2007)] can protect highly entangled states against decoherence. We provide analytical results that explain the robustness of jump feedback, and also analyze the perspectives of experimental implementation by scrutinizing the effects of imperfections and approximations in our model.

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Received 2 May 2008

DOI:https://doi.org/10.1103/PhysRevA.78.012334

Authors & Affiliations

A. R. R. Carvalho¹, A. J. S. Reid¹, and J. J. Hope²

¹Department of Physics, Faculty of Science, The Australian National University, ACT 0200, Australia
²Australian Centre for Quantum-Atom Optics, Department of Physics, Faculty of Science, The Australian National University, ACT 0200, Australia

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Vol. 78, Iss. 1 — July 2008

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