Effect of feedback control on the entanglement evolution
School of Physics and Optoelectronic Technology,
Dalian University of Technology, Dalian 116024, P.R. China
Revised: 6 September 2009
Published online: 8 December 2009
We study the effect of feedback control on the entanglement evolution of two spins in a dissipative cavity governed by the Lindblad master equation. By numerically solving the master equation, we show that the entanglement can be controlled by the feedback based on the quantum jumps of the field in a leaking cavity. With the feedback added to the spins, the stable states with high degree of entanglement can be obtained in absence of the spontaneous decay of the spins, and the entanglement can also be generated for a period in presence of spontaneous decay of the spins. All the controlled entangled states are closely related to the initial states.
PACS: 03.67.Mn – Entanglement measures, witnesses, and other characterizations / 03.65.Yz – Decoherence; open systems; quantum statistical methods / 42.50.Lc – Quantum fluctuations, quantum noise, and quantum jumps / 42.50.Pq – Cavity quantum electrodynamics; micromasers
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009