Enhancement of Macroscopic Quantum Tunneling by Landau-Zener Transitions

Details Enhancement of Macroscopic Quantum Tunneling by Landau-Zener Transitions Enhancement of Macroscopic Quantum Tunneling by Landau-Zener Transitions

2003-04-10

arxiv.org/abs/cond-mat/0304232v2

Phys. Rev. Lett. 91, 016803 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, corrected typos

Scientific paper

10.1103/PhysRevLett.91.016803

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-${1\over 2}$ 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.

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