Observation of macroscopic Landau-Zener transitions in a superconducting device

Details Observation of macroscopic Landau-Zener transitions in a superconducting device Observation of macroscopic Landau-Zener transitions in a superconducting device

2003-07-21

arxiv.org/abs/cond-mat/0307506v2

Europhys. Lett. 65, 844 (2004)

Physics

Condensed Matter

Superconductivity

REVTeX4, 4pp., 4 EPS figures. v2: clarifications added; final, to appear in EPL

Scientific paper

10.1209/epl/i2003-10200-6

A two-level system traversing a level anticrossing has a small probability to make a so-called Landau-Zener (LZ) transition between its energy bands, in deviation from simple adiabatic evolution. This effect takes on renewed relevance due to the observation of quantum coherence in superconducting qubits (macroscopic "Schrodinger cat" devices). We report an observation of LZ transitions in an Al three-junction qubit coupled to a Nb resonant tank circuit.

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