4.8 Article

Quantum Phase Tomography of a Strongly Driven Qubit

Journal

PHYSICAL REVIEW LETTERS
Volume 101, Issue 19, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.190502

Keywords

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Funding

  1. W. M. Keck Foundation Center for Extreme Quantum Information Theory
  2. United States Government
  3. DOE CSGF [DE-FG02-97ER25308]
  4. NSF
  5. 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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