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

Author(s): Leek, Peter J; Fink, Johannes; Blais, Alexandre; Bianchetti, R; Göppl, M; Gambetta, Jay M; Schuster, David I; Frunzio, Luigi; Schoelkopf, Robert J; Wallraff, Andreas
Article Title: Observation of Berry's phase in a solid-state qubit
Abstract: 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.
Keywords: QUANTUM THEORY; Quantum mechanics; microwave radiation; observational method; information processing; mathematical analysis
Journal Title: Science
Volume: 318
Issue 5858
ISSN: 0036-8075
Publisher: American Association for the Advancement of Science  
Date Published: 2007-12-27
Start Page: 1889
End Page: 1892
DOI: 10.1126/science.1149858
Notes: 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
Open access: yes (repository)