Decoherence-free dynamics of quantum discord for two correlated qubits in finite-temperature reservoirs

Details Decoherence-free dynamics of quantum discord for two correlated qubits in finite-temperature reservoirs Decoherence-free dynamics of quantum discord for two correlated qubits in finite-temperature reservoirs

2011-02-13

arxiv.org/abs/1102.2549v1

Physics

Quantum Physics

7 pages, 5 figures

Scientific paper

We investigate decoherence-free evolution (DFE) of quantum discord (QD) for two initially-correlated qubits in two finite-temperature reservoirs using an exactly solvable model. We study QD dynamics of the two qubits coupled to two independent Ohmic reservoirs when the two qubits are initially prepared in X-type quantum states. It is found that reservoir temperature significantly affects the DFE dynamics. We show that it is possible to control the DFE and to prolong the DFE time by choosing suitable parameters of the two-qubit system and reservoirs.

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