Quantum Phase Tomography of a Strongly Driven Qubit

Details Quantum Phase Tomography of a Strongly Driven Qubit Quantum Phase Tomography of a Strongly Driven Qubit

2008-05-12

arxiv.org/abs/0805.1555v1

Phys. Rev. Lett. 101, 190502 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pgs, 4 fgs

Scientific paper

10.1103/PhysRevLett.101.190502

The interference between repeated Landau-Zener transitions in a qubit swept through an avoided level crossing results in Stueckelberg oscillations in qubit magnetization. The resulting oscillatory patterns are a hallmark of the coherent strongly-driven regime in qubits, quantum dots and other two-level systems. The two-dimensional Fourier transforms of these 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 qubit state and show that they can be used to probe dephasing mechanisms in the qubit.

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