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Area of Science:

  • Quantum sensing
  • Condensed matter physics
  • Materials science

Background:

  • Nitrogen-Vacancy (NV) centers in diamond are powerful quantum systems for nanoscale sensing at room temperature.
  • Conventional sensing schemes for NV centers face limitations in sensitivity, spectral resolution, and dynamic range for magnetometry.
  • Existing dynamical decoupling methods offer limited control over NV sensor performance.

Purpose of the Study:

  • To introduce and experimentally validate a novel method, dynamical sensitivity control (DYSCO), to overcome limitations in NV-based nanoscale sensing.
  • To enhance key performance parameters including sensitivity, spectral resolution, and dynamic range for NV magnetometry.
  • To extend the practical applicability of NV spin defects for advanced sensing applications.

Main Methods:

  • Implementation of the DYSCO method, featuring smooth, analog modulation of the quantum probe's sensitivity.
  • Experimental demonstration of decoupled frequency selectivity and spectral resolution over a wide bandwidth.
  • Utilizing off-the-shelf diamond samples for NV sensor characterization.

Main Results:

  • Achieved high-accuracy NV magnetometry without phase ambiguities.
  • Demonstrated a significant enhancement in dynamic range by a factor of 4 x 10^3.
  • Extended interrogation times to over 2 ms, showcasing improved sensor stability and performance.

Conclusions:

  • DYSCO offers a significant advancement over conventional sensing schemes for NV centers.
  • The method provides unprecedented control over quantum probe dynamics, enhancing practical sensing capabilities.
  • DYSCO holds promise for diverse applications in quantum information processing and single-molecule NMR/MRI.