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Journal of Superconductivity and Novel Magnetism

Quantum Entanglement and Correlations in Superconducting Flux Qubits

Marcela Herrera, John Henry Reina

Published Jun 5, 2012• 4 citations
Publisher
DOI
10.1007/s10948-012-1642-x

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We demonstrate the controllable generation of multi-photon Fock states in circuit quantum electrodynamics (circuit QED). The external bias flux regulated by a counter can effectively adjust the bias time on each superconducting flux qubit so that each flux qubit can pass in turn through the circuit cavity and thereby avoid the effect of decoherence. We further investigate the quantum correlation dynamics of coupling superconducting qubits in a Fock state. The results reveal that the lower the photon number of the light field in the number state, the stronger the interaction between qubits is, then the more beneficial to maintaining entanglement between qubits it will be.
We present different quantum correlations, for two superconducting charge qubits in the presence of an applied magnetic flux. We theoretically predict collapse and revival of entanglement in the presence of a magnetic flux without any permanent decay. We theoretically predict the permanent decay of entanglement only with temperature. We also theoretically predict a perfectly entangled state for very low temperatures for small values of the on-site Coulomb charging energies. The behavior of the quantum discord is different, a finite quantum discord also in the seperable state, there is no evidence of oscillations and permanent decay of quantum discord with magnetic flux and temperature. We theoretically predict that the quantum discord predicts the quantum mechanical correlation of the system over the quantum entanglement correlation of the system.