Observation of Berry's Phase in a Solid-State Qubit

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 fau...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2007-12, Vol.318 (5858), p.1889-1892
Main Authors: Leek, P.J, Fink, J.M, Blais, A, Bianchetti, R, Göppl, M, Gambetta, J.M, Schuster, D.I, Frunzio, L, Schoelkopf, R.J, Wallraff, A
Format: Article
Language:English
Subjects:
Cones
Dynamics
Encoding
Fault tolerance
Geometric angles
Geometric lines
Geometry
Interference
Magnetic fields
Mathematical vectors
Microwave resonance
Microwaves
Path dependence
Physics
Quantum theory
Qubits (quantum computing)
Resonators
Superconductivity
Superconductors
Wave functions
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Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1149858