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arXiv:1511.07560 · Quantum Information Processing

Tunable interaction of superconducting flux qubits in circuit QED

Zheng-Yuan Xue, Ya-Fei Li, Jian Zhou, Yu-Mei Gao, Gang Zhang

Published Nov 23, 2015• 6 citations
arXivHTMLPDF
DOI
10.1007/s11128-015-1185-8

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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.