Mach-Zehnder interferometry in a strongly driven superconducting qubit.

@article{Oliver2005MachZehnderII,
  title={Mach-Zehnder interferometry in a strongly driven superconducting qubit.},
  author={William D. Oliver and Yonghao Yu and Janice C. Lee and Karl K Berggren and Leonid S Levitov and T. P. Orlando},
  journal={Science},
  year={2005},
  volume={310 5754},
  pages={1653-7}
}
We demonstrate Mach-Zehnder-type interferometry in a superconducting flux qubit. The qubit is a tunable artificial atom, the ground and excited states of which exhibit an avoided crossing. Strongly driving the qubit with harmonic excitation sweeps it through the avoided crossing two times per period. Because the induced Landau-Zener transitions act as coherent beamsplitters, the accumulated phase between transitions, which varies with microwave amplitude, results in quantum interference fringes… CONTINUE READING
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