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Area of Science:

  • Quantum physics
  • Materials science
  • Nanotechnology

Background:

  • Nitrogen-vacancy (NV) centers in diamond exhibit unique optical and spin properties, making them suitable for quantum sensing applications.
  • The performance of NV-based sensors depends on the controlled creation of these atomic-scale defects.

Purpose of the Study:

  • To fabricate preferentially oriented, shallow NV centers for sensing DC magnetic fields.
  • To investigate methods for improving the coherence times and magnetic field sensitivity of NV ensembles.

Main Methods:

  • Fabrication of preferentially oriented, shallow NV center ensembles in diamond.
  • Control of the P1 spin bath to reduce environmental noise.
  • Application of homonuclear decoupling sequences to mitigate NV-NV interactions and external spin noise.

Main Results:

  • Achieved a 4-fold improvement in the dephasing time (T2*) of the NV ensemble by controlling the P1 spin bath.
  • Extended the ensemble T2* to 10 μs by combining spin-bath control and homonuclear decoupling.
  • Demonstrated an improved DC magnetic field sensitivity of 1.2 nT μm3/2 Hz-1/2.

Conclusions:

  • Controlled manipulation of the spin bath and application of decoupling protocols are crucial for enhancing NV ensemble coherence.
  • Engineered NV centers combined with advanced decoupling techniques show significant promise for high-sensitivity magnetometry.