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IEEE International Conference on Information and Automation (ICIA)

Control of entanglement and non-classical effects in circuit QED

Yinghua Ji

Published Aug 1, 2015• 0 citations
Publisher

Abstract

Through manipulating the external capacitor or external classical microwave impulse, the coupling between superconducting qubits and cavity can be manipulated, the entanglement effect between field modes can be enhanced and the decoherence effect can be effectively suppressed. Further investigations indicate that, the time evolution of the quantum entanglement between field modes is always accompanied by the synchronous changes of certain non-classical effect. Once entanglement sudden death occurs, the non-classical effects disappear.

DOI
10.1109/icinfa.2015.7279618

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In this work, we have studied the dynamics of entanglement of two identical superconducting qubits resonantly interacting with the one-mode field of a coplanar microwave cavity without loss through single-photon transitions in the presence of third- and fifth-order nonlinearities. Based on the solution of the equation of evolution of the system for the Fock initial states of the cavity field, the criterion of qubits entanglement negativity is calculated. The results of the negativity calculation show that for the initial separable states, the cavity nonlinearity can lead to a significant increase in the maximum degree of qubit entanglement. It is shown that for the initial entangledstates of qubits and intense cavity fields, taking into account nonlinearities leads to stabilization of the degree of entanglement of qubits in the cavity and contributes to the disappearance of the effect of the entanglement sudden death of qubits.