The Coherence Time of Asymmetric Gaussian Confinement Potential Quantum Well Qubit

Abstract

Coherent properties are critical to quantum communication. The coherent properties of qubits have been considered for a RbCl asymmetric Gaussian confinement potential quantum well (AQCPQW) qubit by the Pekar-type variational method (PTVM) and the Fermi Golden Rule. Then, we analytically derived the coherence time (CT) changes with the polaron radius, the height and range of the AGCPQW. On the bases of the present work’s numerical results, the CT will increase with the decrease in the height of the AGCPQW and the polaron radius. The CT decreases firstly and then increases with the increase in the confinement potential’s range, and when the confinement potential’s range takes the appropriate value, the CT takes a minimum value.