Entanglement and quantum discord dynamics of two atoms under practical feedback control

Details Entanglement and quantum discord dynamics of two atoms under practical feedback control Entanglement and quantum discord dynamics of two atoms under practical feedback control

2011-04-08

arxiv.org/abs/1104.1488v1

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

We study the dynamics of two identical atoms resonantly coupled to a single-mode cavity under practical feedback control, and focus on the detection inefficiency. The entanglement is induced to vanish in finite time by the inefficiency of detection. Counterintuitively, the asymptotic entanglement and quantum discord can be increased by the inefficiency of detection. The noise of detection triggers control field to create entanglement and discord when no photon are emitted from the atoms. Furthermore, sudden change happens to the dynamics of entanglement.

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