Qubit Zoo

Millimeter wave readout of a superconducting qubit

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Extends circuit-QED readout into the millimeter-wave band by coupling a conventional transmon to a highly detuned 34.7-GHz three-dimensional cavity mode.

Key Results

  • 34.7-GHz cavity coupled to a 3.1-GHz transmon at GHz.
  • No resonant state transitions observed up to 1,000 drive photons.
  • Greater than 99% readout fidelity with more than 100 photons and no quantum-limited first-stage amplifier.

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