Physics – Quantum Physics
Scientific paper
2010-11-10
J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 035501
Physics
Quantum Physics
6 pages, 4 figures
Scientific paper
10.1088/0953-4075/44/3/035501
We study the dynamics of quantum coherence and quantum correlations in two semiconductor double-dot molecules separated by a distance and indirectly coupled via a transmission line resonator. Dominant dissipation processes are considered. The numerical results show the sudden death of entanglement and the robustness of quantum discord to sudden death. Furthermore, the results indicate the dephasing processes in our model can lead in the revival and decay of coherence and discord with the absence of entanglement for certain initial states. By observing the dynamics of coherence versus discord for different initial states, we find that the similarities and differences of coherence and discord are not only related to the dependance of discord on optimizing the measurement set, but more importantly to the coherences in individual qubits which are captured by the adopted coherence measure.
Jin Jia-sen
Li Camille
Pei Pei
Song He-shan
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