Observation of Berry's phase in a solid-state qubit

P. Leek, J.M. Fink, A. Blais, R. Bianchetti, M. Göppl, J. Gambetta, D. Schuster, L. Frunzio, R. Schoelkopf, A. Wallraff, Science 318 (2007) 1889–1892.

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Leek, Peter J; Fink, Johannes MIST Austria ; Blais, Alexandre; Bianchetti, R; Göppl, M; Gambetta, Jay M; Schuster, David I; Frunzio, Luigi; Schoelkopf, Robert J; Wallraff, Andreas
In quantum information science, the phase of a wave function plays an important role in encoding information. Although most experiments in this field rely on dynamic effects to manipulate this information, an alternative approach is to use geometric phase, which has been argued to have potential fault tolerance. We demonstrated the controlled accumulation of a geometric phase, Berry's phase, in a superconducting qubit; we manipulated the qubit geometrically by means of microwave radiation and observed the accumulated phase in an interference experiment. We found excellent agreement with Berry's predictions and also observed a geometry-dependent contribution to dephasing.
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Supported by the EC via an Intra-European Marie Curie Fellowship (P.J.L.), the Natural Sciences and Engineering Research Council of Canada, Canadian Institute for Advanced Research, and Fonds Québécois de la Recherche sur la Nature et les Technologies (A.B.), the National Security Agency under the Army Research Office, NSF, and Yale University (D.I.S., L.F., and R.J.S.), Consiglio Nazionale delle Ricerche–Istituto di Cibernetica, Pozzuoli, Italy (L.F.), the Ontario Research Development Challenge Fund and Mathematics of Information Technology and Complex Systems (J.M.G.), the Swiss National Science Foundation, and ETH Zürich
1889 - 1892

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Leek P, Fink JM, Blais A, et al. Observation of Berry’s phase in a solid-state qubit. Science. 2007;318(5858):1889-1892. doi:10.1126/science.1149858
Leek, P., Fink, J. M., Blais, A., Bianchetti, R., Göppl, M., Gambetta, J., … Wallraff, A. (2007). Observation of Berry’s phase in a solid-state qubit. Science, 318(5858), 1889–1892. https://doi.org/10.1126/science.1149858
Leek, Peter, Johannes M Fink, Alexandre Blais, R Bianchetti, M Göppl, Jay Gambetta, David Schuster, Luigi Frunzio, Robert Schoelkopf, and Andreas Wallraff. “Observation of Berry’s Phase in a Solid-State Qubit.” Science 318, no. 5858 (2007): 1889–92. https://doi.org/10.1126/science.1149858.
P. Leek et al., “Observation of Berry’s phase in a solid-state qubit,” Science, vol. 318, no. 5858, pp. 1889–1892, 2007.
Leek P, Fink JM, Blais A, Bianchetti R, Göppl M, Gambetta J, Schuster D, Frunzio L, Schoelkopf R, Wallraff A. 2007. Observation of Berry’s phase in a solid-state qubit. Science. 318(5858), 1889–1892.
Leek, Peter, et al. “Observation of Berry’s Phase in a Solid-State Qubit.” Science, vol. 318, no. 5858, American Association for the Advancement of Science, 2007, pp. 1889–92, doi:10.1126/science.1149858.
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