Mach-Zehnder Interferometry in a Strongly Driven Superconducting Qubit

Details Mach-Zehnder Interferometry in a Strongly Driven Superconducting Qubit Mach-Zehnder Interferometry in a Strongly Driven Superconducting Qubit

2005-12-29

arxiv.org/abs/cond-mat/0512691v1

Science Vol. 310, Issue 5754, pp. 1653-1657 (2005). Published online 10 November 2005

Physics

Condensed Matter

Superconductivity

14 pages, 6 figures

Scientific paper

10.1126/science.1119678

We demonstrate Mach-Zehnder-type interferometry in a superconducting flux qubit. The qubit is a tunable artificial atom, whose ground and excited states exhibit an avoided crossing. Strongly driving the qubit with harmonic excitation sweeps it through the avoided crossing two times per period. As the induced Landau-Zener transitions act as coherent beamsplitters, the accumulated phase between transitions, which varies with microwave amplitude, results in quantum interference fringes for n=1...20 photon transitions. The generalization of optical Mach-Zehnder interferometry, performed in qubit phase space, provides an alternative means to manipulate and characterize the qubit in the strongly-driven regime.

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