Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.190502
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Funding
- W. M. Keck Foundation Center for Extreme Quantum Information Theory
- United States Government
- DOE CSGF [DE-FG02-97ER25308]
- NSF
- U.S. DOD [FA8721-05-C-0002]
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The interference between repeated Landau-Zener transitions in a qubit swept through an avoided level crossing results in Stuckelberg oscillations in qubit magnetization, a hallmark of the coherent strongly driven regime in two-level systems. The two-dimensional Fourier transforms of the resulting oscillatory patterns are found to exhibit a family of one-dimensional curves in Fourier space, in agreement with recent observations in a superconducting qubit. We interpret these images in terms of time evolution of the quantum phase of the qubit state and show that they can be used to probe dephasing mechanisms.
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