Landau-Zener interferometry for qubits

Details Landau-Zener interferometry for qubits Landau-Zener interferometry for qubits

2001-10-23

arxiv.org/abs/cond-mat/0110490v2

Eur. Phys. J. B 36, 263 (2003)

Physics

Condensed Matter

7 pages, 2 figures; added: microscopic derivation of the master equation, finite temperature of the reservoir

Scientific paper

10.1140/epjb/e2003-00343-8

One may probe intrinsic coherence of a qubit by periodically sweeping its control parameter. The qubit is then excited by Landau-Zener (LZ) mechanism. The interference between multiple LZ transition leads to the unusual oscillatory dependence of the energy absorption rate on sweeping amplitude and period. This interference pattern allows to determine the decoherence time of the qubit. We introduce a simple phenomenological model describing this "interferometer", and find the form of the interference pattern.

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