Enhancement of macroscopic quantum tunneling by Landau-Zener transitions.

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 the presence of coupling to a spin-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.

• Publication year

  2003

• Venue

  Physical Review Letters

• Publication date

  2003-04-10

• Fields of study

  Medicine, Physics

• Identifiers
  DOI 10.1103/PhysRevLett.91.016803arXiv cond-mat/0304232PMID 12906564
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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