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Increased connectivity and fast gates for superconducting qubits with a common galvanic SQUID coupler

ORAL

Abstract

Most popular superconducting qubit system architectures employ pairwise nearest-neighbor (either fixed or tunable) couplings between qubits and individualized readout resonators. In these systems the localized nearest-neighbor connectivity can create overhead for algorithm circuit decomposition requiring numerous SWAP operations. However, there are feasible alternative architectures that increase qubit connectivity and multiplex control and readout resources, both benefitting scalability considerations. With appropriate parameter choice and frequency allocation, groups of qubits with all-to-all connectivity can be achieved despite the challenge of the quadratic increase in the number of pairwise interactions with increasing qubit count. Here, we present an experimental system of three transmons galvanically coupled with a shared tunable SQUID element. This system combines all-to-all connectivity with high on/off coupling ratios and fast parametrically driven interactions for both 2-qubit and 3-qubit gates.

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Presenters

  • Zachary L Parrott

    University of Colorado, Boulder, University of Colorado Boulder, National Institute of Standards and Technology, University of Colorado Boulder, National Institute of Standards and Technology Boulder, National Institute of Standards and Technology Boulder, University of Colorado Boulder, University of Colorado Boulder

Authors

  • Zachary L Parrott

    University of Colorado, Boulder, University of Colorado Boulder, National Institute of Standards and Technology, University of Colorado Boulder, National Institute of Standards and Technology Boulder, National Institute of Standards and Technology Boulder, University of Colorado Boulder, University of Colorado Boulder

  • Sudhir K Sahu

    University of Massachusetts Lowell, University of Massachusetts Lowell, National Institute of Standards and Technology, National Institute of Standards and Technology, University of Massachusetts Lowell, National Institute of Standards and Technology Boulder, University of Massachusetts Lowell

  • Trevyn F Larson

    National Institute of Standards and Technology Boulder, National Institute of Standards and Technology

  • Kaixuan Ji

    University of Colorado, Boulder, University of Colorado Boulder, National Institute of Standards and Technology, University of Colorado Boulder, National Institute of Standards and Technology Boulder, National Institute of Standards and Technology Boulder, University of Colorado Boulder

  • Akash V Dixit

    National Institute of Standards and Technology, National Institute of Standards and Technology Boulder

  • José A Estrada

    University of Colorado Boulder, National Institute of Standards and Technology, University of Colorado Boulder, National Institute of Standards and Technology Boulder

  • Anthony P McFadden

    National Institute of Standards and Technology, National Institute of Standards and Technology Boulder

  • Kristen L Genter

    University of Colorado Boulder, National Institute of Standards and Technology, University of Colorado, Boulder, University of Colorado Boulder, National Institute of Standards and Technology Boulder, National Institute of Standards and Technology, University of Colorado Boulder, National Institute of Standards and Technology Boulder, University of Colorado Boulder

  • Katarina Cicak

    National Institute of Standards and Technology (NIST), National Institute of Standards and Technology, National Institute of Standards and Technology Boulder

  • Raymond W Simmonds

    National Institute of Standards and Technology Boulder, National Institute of Standards and Technology, National Institute of Standards and Technology Boulder, University of Colorado Boulder