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Flux Qubits Fabricated using a High-Coherence Transmon Fabrication Process

ORAL

Abstract

The coherence of superconducting circuit qubits has dramatically improved since initial implementations, leaping from T1 ~1 ns in early Cooper pair boxes to now attaining ~100 μs in transmons. Much of this improvement has involved careful electromagnetic design paired with fabrication and material research. Our in-house fabrication protocol has been previously optimized for transmons, and we now apply these methods to flux qubits. Numerical simulations were performed to investigate the flux qubit energy spectrum, qubit-resonator coupling, and noise susceptibility to inform design parameters. After optimizing the fabrication process, we present work investigating flux qubits in 3D cavities, in addition to an 8-qubit ring of alternating flux qubits and transmons with nearest neighbor coupling. We perform initial investigations into two-qubit gates between flux qubits and transmons of opposing anharmonicity.

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Presenters

  • Trevor Chistolini

    Physics, University of California, Berkeley, Univ of California - Berkeley

Authors

  • Trevor Chistolini

    Physics, University of California, Berkeley, Univ of California - Berkeley

  • William Livingston

    University of California, Berkeley, Univ of California – Berkeley, Univ of California - Berkeley

  • John Mark Kreikebaum

    Lawrence Berkeley National Laboratory, University of California, Berkeley, Univ of California – Berkeley, Physics, University of California, Berkeley

  • David Ivan Santiago

    Lawrence Berkeley National Laboratory, University of California, Berkeley, Lawrence Berkely National Laboratory, Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley

  • Irfan Siddiqi

    Lawrence Berkeley National Laboratory, University of California, Berkeley, Univ of California - Berkeley, Univ of California – Berkeley, Quantum Nanoelectronics Lab, UC Berkeley, Physics, University of California, Berkeley, Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley