Phys. Rev. Lett. 105, 100502 (2010) [4 pages]High-Coherence Hybrid Superconducting QubitReceived 30 April 2010; published 1 September 2010 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. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.105.100502
DOI:
10.1103/PhysRevLett.105.100502
PACS:
03.67.Lx, 03.65.Yz, 74.50.+r
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