Disentanglement in a two-qubit system subjected to dissipation environments RID A-4660-2010
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We investigate the time evolution of entanglement of various entangled states of a two-qubit system exposed to either thermal or squeezed reservoirs. We show that, except for the vacuum reservoir, the sudden-death of entanglement always exists in the thermal and squeezed reservoirs. We present explicit expression for the sudden-death time of entanglement for various entangled states. We find that the sudden-death of entanglement results from the portion of the double excitation component in the initial entangled state. In this sense, the maximally entangled states of a two-qubit system that do not have the double excitation component is more robust against the quantum fluctuations of the vacuum reservoir.
DescriptionJournals published by the American Physical Society can be found at http://publish.aps.org/
DepartmentPhysics and Astronomy
- Faculty Publications