Quantum entanglement for two qubits in a nonstationary cavity

TL;DR

This paper investigates how rapid boundary condition changes in a nonstationary cavity can generate quantum entanglement between two superconducting qubits through the dynamical Lamb effect, providing a measure of entanglement via concurrence.

Contribution

It introduces a method to quantify entanglement in two qubits caused by the dynamical Lamb effect in a nonstationary cavity, with potential physical realization using superconducting qubits.

Findings

Conditional concurrence as a measure of entanglement

Dependence of entanglement on photon number

Feasibility of experimental realization with superconducting qubits

Abstract

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.