Manipulating entanglement sudden death of two-qubit X-states in zero- and finite-temperature reservoirs
Mazhar Ali, G. Alber, A. R. P. Rau · Journal of Physics B Atomic Molecular and Optical Physics · 2008
Manipulation of sudden death of entanglement (ESD) of two qubits interacting with statistically uncorrelated thermal reservoirs is investigated. It is shown that for initially prepared X-states of the two qubits a simple (necessary and sufficient) criterion for ESD can be derived with the help of the Peres–Horodecki criterion. It is shown analytically that, in contrast to the zero-temperature case, at finite temperature of at least one of the reservoirs all initially prepared two-qubit X-states exhibit ESD. General conditions are derived under which ESD can be hastened, delayed or averted.