Tunneling out of metastable vacuum in a system consisting of two capacitively coupled phase qubits

摘要

Using a powerful combination of Coleman's instanton technique and the methodof Banks and Bender, the exponential factor for the zero temperature rate oftunneling out of metastable vacuum in a system of two identical capacitivelycoupled phase qubits is calculated in closed form to second order in asymmetryparameter for a special case of intermediate coupling C=C_J/2.