Enhancement of Macroscopic Quantum Tunneling by Landau-Zener Transitions

Abstract

Motivated by recent realizations of qubits with a readout by macroscopic quantum tunneling in a Josephson junction, we study the problem of barrier penetration in presence of coupling to a spin-$\frac{1}{2}$ system. It is shown that when the diabatic potentials for fixed spin intersect in the barrier region, Landau- -Zener transitions lead to an enhancement of the tunneling rate. The effect of these spin flips in imaginary time is in qualitative agreement with experimental observations.

5 pages, corrected typos

References in corpus (2)

• Manipulating the Quantum State of an Electrical Circuit
• Aharonov-Casher-Effect Suppression of Macroscopic Tunneling of Magnetic Flux

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