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Decoherence-free subspace and entanglement by interaction with a common squeezed bath

D. Mundarain and M. Orszag
Phys. Rev. A 75, 040303(R) – Published 30 April 2007

Abstract

In this work we find explicitly the decoherence-free subspace (DFS) for a two two-level system in a common squeezed vacuum bath. We also find an orthogonal basis for the DFS composed of a symmetrical and an antisymmetrical (under particle permutation) entangled state. For any initial symmetrical state, the master equation has one stationary state which is the symmetrical entangled decoherence-free state. In this way, one can generate entanglement via a common squeezed bath of the two systems. If the initial state does not have a definite parity, the stationary state depends strongly on the initial conditions of the system and it is a statistical mixture of states which belong to DFS. We also study the effect of the coupling between the two-level systems on the DFS.

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  • Received 26 September 2006

DOI:https://doi.org/10.1103/PhysRevA.75.040303

©2007 American Physical Society

Authors & Affiliations

D. Mundarain1 and M. Orszag2

  • 1Departamento de Física, Universidad Simon Bolívar, Apartado Postal 89000, Caracas 1080A, Venezuela
  • 2Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago, Chile

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Issue

Vol. 75, Iss. 4 — April 2007

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