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Sequential Bayesian experiment design for adaptive Ramsey sequence measurements.

Robert D McMichael1, Sergey Dushenko1,2, Sean M Blakley1

  • 1Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Journal of Applied Physics
|January 9, 2023
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Summary
This summary is machine-generated.

This study introduces a Bayesian experiment design for optimizing Ramsey measurements in spin qubits. This method significantly speeds up parameter estimation compared to other protocols, enhancing quantum phase measurement efficiency.

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Area of Science:

  • Quantum Information Science
  • Quantum Measurement and Control
  • Atomic, Molecular, and Optical Physics

Background:

  • Ramsey sequences are fundamental for spin qubit quantum phase measurements.
  • Optimizing measurement efficiency relies on precise control of phase accumulation time (τ).
  • Low-fidelity measurements present challenges for accurate parameter estimation.

Purpose of the Study:

  • Implement and evaluate a sequential Bayesian experiment design protocol for Ramsey measurements.
  • Compare the Bayesian approach against adaptive heuristic, quantum phase estimation, and random search methods.
  • Assess the impact of concurrent measurement and design calculations on experimental workflow.

Main Methods:

  • Sequential Bayesian experiment design applied to Ramsey sequences.
  • Concurrent execution of quantum measurements and Bayesian design calculations.
  • Comparative analysis with adaptive heuristic, quantum phase estimation, and random τ selection.

Main Results:

  • The Bayesian design protocol significantly accelerates the estimation of a single parameter (precession frequency) compared to other methods.
  • For estimating multiple parameters, the Bayesian approach achieves comparable sensitivity to random search but converges four times faster.
  • Concurrent computation largely eliminates computational overhead from measurement time.

Conclusions:

  • Sequential Bayesian experiment design offers a substantial speedup for quantum phase measurements using Ramsey sequences.
  • This protocol enhances the efficiency and practicality of spin qubit characterization.
  • Integrating design calculations with measurements streamlines quantum experimental workflows.