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Noise-robust quantum sensing via optimal multi-probe spectroscopy.

Matthias M Müller1,2,3,4, Stefano Gherardini1,2,3,4, Filippo Caruso5,6,7,8

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We present new methods for characterizing dephasing environments using quantum probes. These fast and robust strategies leverage quantum control and entanglement for precise noise spectral analysis.

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Area of Science:

  • Quantum Physics
  • Quantum Information Science
  • Environmental Sensing

Background:

  • Quantum systems interact with their environment, influencing their dynamics.
  • Observing quantum systems (probes) can reveal environmental properties.
  • Dynamical decoupling and Ramsey interference measurements can spectrally resolve noise fields.

Purpose of the Study:

  • To introduce fast and robust estimation strategies for characterizing dephasing environments.
  • To enable spectral analysis of both classical and quantum dephasing noise.
  • To provide tools for understanding and mitigating environmental noise effects on quantum systems.

Main Methods:

  • Utilizing filter function orthogonalization for noise spectrum estimation.
  • Employing optimal control filters to maximize Fisher Information.
  • Leveraging multi-qubit entanglement for enhanced measurement sensitivity.
  • Implementing dynamical decoupling sequences for noise spectral resolution.

Main Results:

  • Developed novel strategies for fast and robust characterization of dephasing environments.
  • Demonstrated the effectiveness of filter function orthogonalization and optimal control.
  • Quantified the robustness of the proposed schemes against various noise sources.
  • Showcased the role of multi-qubit entanglement in improving spectral estimation.

Conclusions:

  • The introduced strategies offer efficient and reliable methods for environmental noise characterization.
  • The developed techniques are robust against practical limitations like measurement imprecision and probe dephasing.
  • These findings contribute to advancing quantum sensing and quantum information processing technologies.