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Enhanced Gravity Sensing by a Levitated Mesoscopic Nanoparticle.

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This summary is machine-generated.

We developed a new quantum gravity-sensing protocol using levitated nanodiamonds. This method enhances sensitivity and reduces device size for compact, high-precision gravimeters.

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Area of Science:

  • Quantum physics
  • Nanotechnology
  • Gravimetry

Background:

  • Quantum control of levitated nanoparticles is now possible.
  • Mesoscopic quantum systems offer advantages for enhanced quantum sensing.
  • Levitated nanoparticles enable enhanced quantum sensing due to their large mass.

Purpose of the Study:

  • Propose an enhanced gravity-sensing protocol for levitated nanodiamonds.
  • Improve sensing sensitivity and reduce device size for gravimeters.
  • Utilize transient free fall for improved phase accumulation.

Main Methods:

  • Levitating a nanodiamond in a linear ion trap.
  • Implementing transient free fall to introduce gravitational acceleration.
  • Employing phonon-mediated one-axis twisting dynamics for spin squeezing.

Main Results:

  • Achieved square-accelerated relative phase accumulation for higher sensitivity.
  • Reached standard quantum limit for nanodiamonds with multiple nitrogen-vacancy (N-V) centers.
  • Demonstrated sensitivity surpassing the standard quantum limit (N^{-5/6} scaling) with spin squeezing.

Conclusions:

  • The protocol offers a pathway to compact and highly sensitive gravimeters.
  • Decoherence and control errors are negligible under achievable experimental conditions.
  • Sensitivity reaches ~18 μGal/√Hz for one N-V center and >0.4 μGal/√Hz for 100 N-V centers.