Influence of Kerr nonlinearity on the entanglement between two Josephson charge qubits
Kristina A. Moiseeva, Samara National Research University
Abstract
In this work, we studied the dynamics of entanglement of two identical charge qubits with Josephson junctions in the case when one of the qubits is exposed to a microwave field in a coherent state in the presence of a Kerr nonlinearity. We have found the exact solution of the quantum time evolution equation system for the wave function in the case of initial separable and entangled states of qubits. The exact solution of the evolution equation is used to calculate the criterion for entanglement of qubits – concurrence. The results of numerical simulation of the time dependence of the concurrence showed that in the presence of a Kerr nonlinearity, the realization of long-lived entangled states is possible.
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Eugene K. Bashkirov
Samara National Research University
Russia
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