Ji, Ying-Hua; Liu, Yong-Mei Regulation of entanglement and geometric quantum discord of hybrid superconducting qubits for circuit QED. (English) Zbl 1276.81014 Int. J. Theor. Phys. 52, No. 9, 3220-3228 (2013). Summary: We investigate the dynamic evolution behaviors of entanglement and geometric quantum discord (GQD) of hybrid qubits in a circuit QED system. Under certain initial conditions, interactions between qubits and that between the qubit and the cavity can suppress the decay of entanglement and GQD of qubits. Under the initial condition \(|\psi_Q(0)\rangle_I=\sin\alpha|\downarrow\uparrow\rangle+\cos\alpha|\uparrow\downarrow \rangle\), such decay was avoided by increasing the coupling strength ratio between qubits and that between the qubit and the cavity. Under the aforementioned condition, the survival time of entanglement and GQD was prolonged by decreasing the coupling strength ratio between qubits and that between the qubit and the cavity. Cited in 5 Documents MSC: 81P40 Quantum coherence, entanglement, quantum correlations 81P15 Quantum measurement theory, state operations, state preparations 81V10 Electromagnetic interaction; quantum electrodynamics 81V80 Quantum optics 82D55 Statistical mechanics of superconductors Keywords:hybrid qubit; circuit QED; concurrence; geometric quantum discord PDFBibTeX XMLCite \textit{Y.-H. Ji} and \textit{Y.-M. Liu}, Int. J. Theor. Phys. 52, No. 9, 3220--3228 (2013; Zbl 1276.81014) Full Text: DOI References: [1] Browne, D.E., Plenio, M.B.: Robust generation of entanglement between two cavities mediated by short interactions with an atom. Phys. Rev. A 67, 012325 (2003) · doi:10.1103/PhysRevA.67.012325 [2] Deng, Z.J., Feng, M., Gao, K.L.: Simple scheme for generating an n-qubit W state in cavity QED. Phys. Rev. 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