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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Sequential Dispersive Measurement of a Superconducting Qubit.

T Peronnin1, D Marković2, Q Ficheux1

  • 1Université Lyon, ENS de Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire de Physique, F-69342 Lyon, France.

Physical Review Letters
|May 23, 2020
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Summary

We developed a superconducting device for fast, high-fidelity transmon qubit measurement. This method overcomes limitations of traditional dispersive readout, achieving 97.5% fidelity in 220 ns.

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Area of Science:

  • Quantum computing
  • Superconducting circuits
  • Quantum information science

Background:

  • Dispersive readout of superconducting qubits faces limitations like the Purcell effect and cavity mode transients.
  • Efficient and high-fidelity qubit measurement is crucial for advancing quantum computation.

Purpose of the Study:

  • To present a novel superconducting device for sequential measurement of transmon qubits.
  • To overcome common limitations in dispersive readout methods.
  • To achieve fast and high-fidelity qubit state determination.

Main Methods:

  • A superconducting device enabling on-demand coupling to a measurement channel.
  • Loading a readout resonator coupled to the transmon qubit.
  • Utilizing a microwave pump for rapid upconversion and release of resonator content.
  • Measuring released field quadratures and performing Wigner tomography.

Main Results:

  • Achieved a readout fidelity of 97.5% within a total measurement time of 220 ns.
  • Demonstrated a characteristic release time of 10 ns, significantly shorter than the resonator lifetime.
  • Characterized the non-Gaussian nature and dynamics of the readout mode.

Conclusions:

  • The developed device effectively disables common dispersive readout limitations.
  • The rapid, on-demand measurement technique enables high-fidelity qubit readout.
  • This approach advances the capabilities for quantum information processing with superconducting qubits.