Dark periods and revivals of entanglement in a two-qubit system

Ficek, Z. and Tanas, R. (2006) Dark periods and revivals of entanglement in a two-qubit system. Physical Review A, 74 2: . doi:10.1103/PhysRevA.74.024304

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Author Ficek, Z.
Tanas, R.
Title Dark periods and revivals of entanglement in a two-qubit system
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2006
Sub-type Article (original research)
DOI 10.1103/PhysRevA.74.024304
Open Access Status File (Publisher version)
Volume 74
Issue 2
Total pages 4
Editor B Crasemann
Place of publication United States
Publisher American Physical Society
Collection year 2006
Language eng
Subject C1
240301 Atomic and Molecular Physics
780102 Physical sciences
Abstract In a recent paper Yu and Eberly [Phys. Rev. Lett. 93, 140404 (2004)] have shown that two initially entangled and afterward not interacting qubits can become completely disentangled in a finite time. We study transient entanglement between two qubits coupled collectively to a multimode vacuum field, assuming that the two-qubit system is initially prepared in an entangled state produced by the two-photon coherences, and find the unusual feature that the irreversible spontaneous decay can lead to a revival of the entanglement that has already been destroyed. The results show that this feature is independent of the coherent dipole-dipole interaction between the atoms but it depends critically on whether or not collective damping is present.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Spontaneous Emission
2-atom Entanglement
2 Qubits
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 09:50:46 EST