Entanglement and mixedness of a superconducting qubit coupled to an open superconducting cavity
Abdel-Baset A. Mohamed
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We investigate entanglement and mixedness of a superconducting qubit coupled to the damped cavity ﬁeld. We introduce a new measure for the mixedness and ﬁnd that the phase damping of the cavity leads to simultaneous long-death of the entropy squeezing, the purity of the qubit states, and the entanglement of the ﬁeld–qubit system.