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

Abstract

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

arXiv comment10 pages, 5 figures (select PostScript to download Fig. 1). Corrected version, to appear in PRB

References in corpus (4)

• Quantum state engineering with Josephson-junction devices
• Tunable coupling of superconducting qubits
• Superconducting Qubits Coupled to Nanoelectromechanical Resonators: An Architecture for Solid-State Quantum Information Processing
• Spectroscopy of capacitively coupled Josephson-junction qubits

Cited by in corpus (1)

• Single-step controlled-NOT logic from any exchange interaction