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Frontiers in Optics

Competing Effects of Environment and Inter-Qubit Interactions in the Entanglement Dynamics of Two qubits

Sumanta Das, G. S. Agarwal

Published Jan 1, 2009• 0 citations
Publisher

Abstract

We show that coherent qubit-qubit interactions lead to bright and dark periods in the entanglement dynamics of two entangled qubits in contact with an environment. This behavior is further found to be generic in nature.
DOI
10.1364/fio.2009.fwi6

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Interaction among the qubits are 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 $&$ Eberly, Phys. Rev. Lett. {\bf 93}, 140404 (2004)] for noninteracting qubits. Further we find that the generation of bright and dark periods are generic and occur for wide varieties of the models of environment. We present explicit results for two popular models.
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