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Zener Enhancement of Quantum Tunneling in a Two-Level Superconducting Circuit

2005; American Physical Society; Volume: 94; Issue: 5 Linguagem: Inglês

10.1103/physrevlett.94.057004

1092-0145

Grégoire Ithier, Eddy Collin, P. Joyez, D. Vion, D. Estève, Joachim Ankerhold, Hermann Grabert,

Physics of Superconductivity and Magnetism

We have investigated the macroscopic quantum tunneling (MQT) of the phase across a Josephson junction embedded in a superconducting circuit. This system is equivalent to a spin 1/2 particle in a potential energy well. The MQT escape rate of such a particle was recently predicted to be strongly modified when a crossing of its inner Zeeman levels occurs while tunneling. In this regime, we observe a significant enhancement of the MQT rate and compare it to theory.