Dissipative Landau-Zener transitions of a qubit: Bath-specific and universal behavior

Keiji Saito, Martijn Wubs, Sigmund Kohler, Yosuke Kayanuma, Peter Hänggi

研究成果: Article査読

117 被引用数 (Scopus)

抄録

We study Landau-Zener transitions in a qubit coupled to a bath at zero temperature. A general formula that is applicable to models with a nondegenerate ground state is derived. We calculate exact transition probabilities for a qubit coupled to either a bosonic or a spin bath. The nature of the baths and the qubit-bath coupling is reflected in the transition probabilities. For diagonal coupling, when the bath causes energy fluctuations of the diabatic qubit states but no transitions between them, the transition probability coincides with the standard Landau-Zener probability of an isolated qubit. This result is universal as it does not depend on the specific type of bath. For pure off-diagonal coupling, by contrast, the tunneling probability is sensitive to the coupling strength. We discuss the relevance of our results for experiments on molecular nanomagnets, in circuit QED, and for the fast-pulse readout of superconducting phase qubits.

本文言語English
論文番号214308
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
75
21
DOI
出版ステータスPublished - 2007 6月 29
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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