Bright and dark periods in the entanglement dynamics of interacting qubits in contact with the environment

Interaction among qubits is the basis to many quantum logic operations. We report how such inter-qubit interactions can lead to new features, in the form of bright and dark periods in the entanglement dynamics of two qubits subject to environmental perturbations. These features are seen to be precur...

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Published inJournal of physics. B, Atomic, molecular, and optical physics Vol. 42; no. 14; pp. 141003 - 141003 (5)
Main Authors Das, Sumanta, Agarwal, G S
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 28.07.2009
Institute of Physics
Subjects
Classical and quantum physics: mechanics and fields
Exact sciences and technology
Foundations, theory of measurement, miscellaneous theories (including aharonov-bohm effect, bell inequalities, berry's phase)
Physics
Quantum computation
Quantum information
Quantum mechanics
Quantum decoherence
Quantum computing
Quantum information
Quantum entanglement
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Summary:Interaction among qubits is the basis to many quantum logic operations. We report how such inter-qubit interactions can lead to new features, in the form of bright and dark periods in the entanglement dynamics of two qubits subject to environmental perturbations. These features are seen to be precursors to the well-known phenomenon of sudden death of entanglement (Yu and Eberly 2004 Phys. Rev. Lett. 93 140404 ) for noninteracting qubits. Further, we find that the generation of bright and dark periods is generic and occurs for wide varieties of environment models. We present explicit results for two popular models.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/42/14/141003