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A Power-Efficient Coplanar Waveguide Design for Enhanced Optical Readout in h-BN Quantum Sensors.

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Researchers developed a new single-port waveguide for hexagonal boron nitride quantum sensors. This compact design significantly improves optical readout and signal quality for magnetic field detection.

Keywords:
coplanar waveguidehBNoptically detected magnetic resonancequantum sensorspin defect

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Area of Science:

  • Quantum Sensing
  • Materials Science
  • Nanotechnology

Background:

  • Growing interest in spin-active boron vacancy (VB-) defects in hexagonal boron nitride (hBN) for quantum sensing.
  • Current hBN quantum sensors face limitations in optical readout and signal noise due to inefficient waveguide designs.
  • Existing waveguides hinder microwave absorption, leading to reduced optically detected magnetic resonance (ODMR) contrast.

Purpose of the Study:

  • To advance hBN-integrated quantum sensors by developing an improved waveguide design.
  • To overcome limitations of conventional two-port waveguides in hBN quantum sensing devices.
  • To enhance optical readout efficiency and signal-to-noise ratio for magnetic field detection.

Main Methods:

  • Development of a compact, single-port coplanar waveguide (CPW) for hBN quantum sensors over three generations.
  • Integration of on-chip optical and microwave excitation capabilities within the CPW design.
  • Characterization of the sensor's performance, including ODMR contrast and radio frequency (RF) magnetic field concentration.

Main Results:

  • Achieved a high ODMR contrast of approximately 28% at low microwave power (400 mW).
  • Demonstrated improved impedance stability and high RF magnetic field concentration without affecting spin properties.
  • Enhanced sensor efficiency by three times and reduced RF power usage by five times.

Conclusions:

  • The developed single-port CPW is a significant advancement for hBN-integrated quantum sensors.
  • The miniaturized sensor design offers robust performance at lower microwave power, ideal for scalable applications.
  • This technology enables more efficient and sensitive magnetic field detection using quantum sensing.