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Isotope engineering for spin defects in van der Waals materials.

Ruotian Gong1, Xinyi Du1, Eli Janzen2

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Nature Communications
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Isotope engineering of hexagonal boron nitride (hBN) enhances spin defects for quantum technology. Using isotopically purified h10B15N, researchers improved coherence times and quantum sensing capabilities of the boron vacancy center.

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Area of Science:

  • Quantum computing and sensing
  • Materials science
  • Condensed matter physics

Background:

  • Spin defects in van der Waals materials are promising for quantum technologies.
  • The negatively charged boron vacancy center ([Formula: see text]) in hexagonal boron nitride (hBN) is a key quantum resource.
  • Enhancing coherence properties of spin defects is crucial for practical quantum applications.

Purpose of the Study:

  • To demonstrate isotope engineering as a method to enhance spin defect properties.
  • To investigate the impact of isotopic purification on the coherence and sensing capabilities of [Formula: see text] centers in hBN.
  • To explore the potential for improved quantum sensing and control using isotopically engineered hBN.

Main Methods:

  • Growth of isotopically purified h10B15N crystals.
  • Characterization of [Formula: see text] spin defects in natural abundance vs. isotopically purified hBN.
  • Measurement of coherence time (T2), relaxation time (T1), and magnetic field sensitivity.
  • Investigation of hyperfine level addressability for nuclear spin control.

Main Results:

  • Isotopically purified h10B15N significantly narrows [Formula: see text] spin transitions.
  • Extended coherence time (T2) and relaxation time (T1) were observed in [Formula: see text] centers within h10B15N.
  • A 4-fold (2-fold) enhancement in DC (AC) magnetic field sensitivity was achieved for quantum sensing.
  • Individual addressability of hyperfine levels enabled coherent control of neighboring 15N nuclear spins.

Conclusions:

  • Isotope engineering is a powerful technique for enhancing quantum spin defects in hBN.
  • This approach significantly improves coherence properties and quantum sensing performance.
  • The findings are extendable to other van der Waals materials for advancing quantum technologies.