Quantum entanglement for two qubits in a nonstationary cavity
  The quantum entanglement and the probability of the dynamical Lamb effect for two qubits caused by non-adiabatic fast change of the boundary conditions are studied. The conditional concurrence of the qubits for each fixed number of created photons in a nonstationary cavity is obtained as a measure of the dynamical quantum entanglement due to the dynamical Lamb effect. We discuss the physical realization of the dynamical Lamb effect, based on superconducting qubits. 
Oleg L. Berman, Roman Ya. Kezerashvili, and Yurii E. Lozovik
quant-ph cond-mat.supr-con physics.optics