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Qubit Measurement by Multichannel Driving.

Joni Ikonen1, Jan Goetz1, Jesper Ilves1

  • 1QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland.

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This summary is machine-generated.

This study introduces a faster qubit measurement technique using a coupled bosonic mode. The new protocol significantly reduces measurement errors compared to conventional methods, potentially aiding resonator state resetting.

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Area of Science:

  • Quantum information science
  • Superconducting quantum computing
  • Quantum measurement

Background:

  • Accurate and efficient qubit measurement is crucial for quantum computation.
  • Conventional dispersive readout methods face limitations in speed and fidelity.

Purpose of the Study:

  • To develop and experimentally validate a novel, accelerated qubit measurement protocol.
  • To enhance measurement speed and fidelity using a dispersively coupled bosonic mode.

Main Methods:

  • Theoretical proposal of a qubit measurement method near a bosonic mode frequency.
  • Experimental implementation using superconducting qubits and a resonator.
  • Simultaneous driving of the bosonic mode to optimize performance.

Main Results:

  • Demonstrated immediate separation of bosonic states for different qubit states, enabling faster measurements.
  • Achieved significantly lower average measurement error compared to conventional dispersive readout.
  • Showcased the potential for unconditional resonator state resetting to vacuum.

Conclusions:

  • The proposed method offers a substantial speedup and improved fidelity for qubit measurements.
  • This technique shows promise for applications in quantum error correction and state preparation.