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Enhancement of quantum coherence in solid-state qubits via interface engineering.

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Researchers enhanced shallow nitrogen-vacancy (NV) centers in diamond for quantum sensing. Interfacial engineering extended NV coherence times to over 1 millisecond, improving sensitivity for nanoscale nuclear magnetic resonance.

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Area of Science:

  • Quantum sensing
  • Materials science
  • Diamond physics

Background:

  • Shallow nitrogen-vacancy (NV) centers in diamond are key quantum sensors.
  • Their coherence times are limited by surface and bulk impurities, hindering performance.

Purpose of the Study:

  • To engineer the interface of shallow NV centers to extend coherence times.
  • To enhance the sensitivity and durability of diamond-based quantum sensors.

Main Methods:

  • Interfacial engineering using oxygen termination and graphene patching.
  • Raman spectroscopy and density-functional theory for surface analysis.
  • Double electron-electron resonance spectroscopy to study spin dynamics.

Main Results:

  • Coherence times extended to over 1 millisecond, approaching the T1 limit.
  • Reduced spin noise achieved through graphene charge transfer and surface electron pairing.
  • Detection of single 13C nuclear spins and external 11B spins demonstrated.

Conclusions:

  • Interfacial engineering significantly enhances shallow NV center coherence and sensitivity.
  • The developed platform enables nanoscale nuclear magnetic resonance.
  • A protective hexagonal boron nitride (h-BN) layer ensures device robustness and material compatibility.