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Related Concept Videos

Atomic Force Microscopy01:08

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Updated: Dec 17, 2025

Atomic Force Microscopy of Red-Light Photoreceptors Using PeakForce Quantitative Nanomechanical Property Mapping
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Truncated Nonlinear Interferometry for Quantum-Enhanced Atomic Force Microscopy.

R C Pooser1, N Savino1,2, E Batson1,3

  • 1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

Physical Review Letters
|July 1, 2020
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate a practical quantum sensor using nonlinear interferometry for enhanced measurements. This quantum-enhanced sensor achieves 3 dB noise reduction below the standard quantum limit for microcantilever displacement.

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Area of Science:

  • Quantum optics
  • Quantum sensing
  • Nanotechnology

Background:

  • Nonlinear interferometers offer potential for quantum-enhanced phase measurements.
  • Practical quantum sensors based on nonlinear interferometry are challenging to realize.

Purpose of the Study:

  • To demonstrate the first practical application of nonlinear interferometry for quantum-enhanced measurements.
  • To measure microcantilever displacement with quantum noise reduction.

Main Methods:

  • Utilized nonlinear interferometry, replacing beam splitters with nonlinear amplifiers.
  • Employed a weak squeezed state for signal transduction and dual homodyne detection.
  • Minimized photon backaction noise.

Main Results:

  • Achieved quantum noise reduction of up to 3 dB below the standard quantum limit.
  • Demonstrated quantum-enhanced measurement of beam displacement at 1.7 fm/sqrt[Hz].

Conclusions:

  • This work presents the first practical nonlinear interferometer for quantum sensing.
  • The developed approach may enable quantum-enhanced broadband, high-speed scanning probe microscopy.