Entanglement versus Quantum Discord in Two Coupled Double Quantum Dots

Details Entanglement versus Quantum Discord in Two Coupled Double Quantum Dots Entanglement versus Quantum Discord in Two Coupled Double Quantum Dots

2009-12-08

arxiv.org/abs/0912.1468v3

New Journal of Physics 12, 073009 (2010)

Physics

Quantum Physics

14 pages, 8 figures (new version is the final version to appear in NJP)

Scientific paper

10.1088/1367-2630/12/7/073009

We study the dynamics of quantum correlations of two coupled double quantum dots containing two excess electrons. The dissipation is included through the contact with an oscillator bath. We solve the Redfield master equation in order to determine the dynamics of the quantum discord and the entanglement of formation. Based on our results, we find that the quantum discord is more resistant to dissipation than the entanglement of formation for such a system. We observe that this characteristic is related to whether the oscillator bath is common to both qubits or not and to the form of the interaction Hamiltonian. Moreover, our results show that the quantum discord might be finite even for higher temperatures in the asymptotic limit.

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