Phase qubits fabricated with trilayer junctions

Details Phase qubits fabricated with trilayer junctions Phase qubits fabricated with trilayer junctions

2010-12-31

arxiv.org/abs/1101.0232v2

Supercond. Sci. Technol. 23 095007 (2011)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1088/0953-2048/24/5/055005

We have developed a novel Josephson junction geometry with minimal volume of lossy isolation dielectric, being suitable for higher quality trilayer junctions implemented in qubits. The junctions are based on in-situ deposited trilayers with thermal tunnel oxide, have micron-sized areas and a low subgap current. In qubit spectroscopy only a few avoided level crossings are observed, and the measured relaxation time of $T_1\approx400\;\rm{nsec}$ is in good agreement with the usual phase qubit decay time, indicating low loss due to the additional isolation dielectric.

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