Hastening, delaying, or averting sudden death of quantum entanglementA. R. P. Rau1, Mazhar Ali2 and G. Alber2
1 Department of Physics and Astronomy, Louisiana State University - Baton Rouge, LA 70803, USA
2 Institut für Angewandte Physik, Technische Universität Darmstadt - D-64289, Germany, EU
received 22 January 2008; accepted in final form 26 March 2008; published May 2008
published online 25 April 2008
The finite time end of entanglement between two decohering qubits can be modified by local, unitary actions performed during the decoherence process. Depending on the time when such action is taken, the end can be speeded up or slowed down, or even averted all together. This phenomenon offers practical applications for the stabilization of entangled quantum states. Details concerning hastening or delaying the finite-time end of entanglement are presented for two qubits which decay spontaneously into statistically independent reservoirs.
03.67.-a - Quantum information.
03.65.Yz - Decoherence; open systems; quantum statistical methods.
03.65.Ud - Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.).
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