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

2007/11/01 by Peter Leek, P. J. Leek, J. M. Fink +14 · 25 citations
Computer Science · Mathematics · Physics and Astronomy · #Berry #Biology #Condensed matter physics #Dephasing #Field (mathematics) #Function (biology) #Geometric phase #Mathematics #Microwave #Phase (matter) #Physics #Pure mathematics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum mechanics #Qubit #Superconductivity #cond-mat.mes-hall #cond-mat.supr-con #quant-ph

paper · pdf · doi:10.1126/science.1149858

published as Science 318, 1889 (2007) · 5 pages, 4 figures, version with high resolution figures available at http://qudev.ethz.ch/content/science/PubsPapers.html

arxiv created 2007/11/01 · openalex publication_date 2007/11/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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.

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