High-coherence hybrid superconducting qubit

We report quantum coherence measurements of a superconducting qubit whose design is a hybrid of several existing types. Excellent coherence times are found: T2∼T1∼1.5 μs. The topology of the qubit is that of a traditional three-junction flux qubit, but it has a large shunting capacitance, and the ra...

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Bibliographic Details
Published in:Physical review letters 2010-09, Vol.105 (10), p.100502-100502, Article 100502
Main Authors: Steffen, Matthias, Kumar, Shwetank, Divincenzo, David P, Rozen, J R, Keefe, George A, Rothwell, Mary Beth, Ketchen, Mark B
Format: Article
Language:English
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Summary:We report quantum coherence measurements of a superconducting qubit whose design is a hybrid of several existing types. Excellent coherence times are found: T2∼T1∼1.5 μs. The topology of the qubit is that of a traditional three-junction flux qubit, but it has a large shunting capacitance, and the ratio of the junction critical currents is chosen so that the qubit potential has a single-well form. The qubit has a sizable nonlinearity, but its sign is reversed compared with most other popular qubit designs. The qubit is read out dispersively using a high-Q resonator in a λ/2 configuration.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.105.100502