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Optimal and Robust Quantum Metrology Using Interaction-Based Readouts.

Samuel P Nolan1, Stuart S Szigeti1,2,3, Simon A Haine4

  • 1School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia.

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This summary is machine-generated.

Achieve robust quantum metrology with flexible, optimal protocols. This study shows that optimal measurements, even with detection noise, are possible in current spin-squeezing experiments.

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Area of Science:

  • Quantum physics
  • Quantum metrology
  • Quantum information science

Background:

  • Quantum metrology demands nonclassical states with high particle numbers and optimal use of quantum correlations.
  • Conventional protocols like spin squeezing face limitations in particle number due to detection resolution.
  • Finding optimal measurements for arbitrary nonclassical states is challenging, limiting quantum enhancement.

Purpose of the Study:

  • To demonstrate flexibility in constructing optimal quantum metrology protocols.
  • To enable protocols that are robust against detection noise while maintaining optimality.
  • To provide criteria for determining optimal measurement bases and assess robustness.

Main Methods:

  • Proving flexibility in constructing optimal protocols.
  • Utilizing the full probability distribution of outcomes in an optimal measurement basis.
  • Quantifying the robustness of interaction-based readouts under experimental constraints.

Main Results:

  • Demonstrated great flexibility in constructing optimal quantum metrology protocols.
  • Showed that protocols can be both optimal and robust to detection noise.
  • Provided criteria for easily accessible optimal measurement bases.
  • Quantified robustness for several classes of interaction-based readouts.

Conclusions:

  • Optimal and robust quantum metrology is achievable in current spin-squeezing experiments.
  • Interaction-based readouts can be designed for both optimality and noise robustness.
  • The findings overcome limitations of conventional quantum metrology protocols.