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Soft decoding of a qubit readout apparatus.

B D'Anjou1, W A Coish2

  • 1Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada.

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Summary
This summary is machine-generated.

Researchers developed a new method to improve qubit readout by utilizing soft information from detector signals. This technique enhances quantum state detection and parameter estimation, offering practical advantages for current quantum computing experiments.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Measurement Science

Background:

  • Qubit readout typically involves converting analog detector signals to digital bits, discarding valuable confidence information.
  • This loss of 'soft information' limits the precision of quantum state detection and parameter estimation.

Purpose of the Study:

  • To investigate the benefits of incorporating analog signal 'soft information' into digital qubit readout.
  • To demonstrate improvements in quantum state detection and parameter estimation using this enhanced readout method.

Main Methods:

  • Developed a framework to leverage a posteriori confidence (soft information) from analog detector signals.
  • Applied the quantum repetition code to enhance state detection accuracy.
  • Utilized the enhanced readout for quantum state and parameter estimation.

Main Results:

  • Significant improvements observed in enhanced state detection using the quantum repetition code.
  • Demonstrated advantages in quantum state and parameter estimation.
  • Improvements were robust against non-Gaussian readout noise, small qubit numbers, and encoding errors.

Conclusions:

  • Incorporating soft information in qubit readout offers substantial, achievable advantages.
  • This method enhances the performance of quantum state tomography, parameter estimation, and qubit readout in current quantum experiments.