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Related Experiment Video

Updated: Oct 30, 2025

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Interferometric Constraints on Spacelike Coherent Rotational Fluctuations.

Jonathan W Richardson1,2, Ohkyung Kwon3,4, H Richard Gustafson5

  • 1Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.

Physical Review Letters
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Summary
This summary is machine-generated.

This study precisely measured rotation-induced displacements using Michelson interferometers, achieving quantum-limited sensing. The findings constrain exotic spacetime models by surpassing sensitivity thresholds related to the Planck time.

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Area of Science:

  • Experimental Physics
  • Quantum Sensing
  • Gravitational Wave Detection

Background:

  • Michelson interferometers are crucial for detecting minute displacements.
  • Sensing exotic phenomena requires high sensitivity and broad frequency bands.
  • Spacetime's rotational degrees of freedom are theorized in quantum geometry.

Purpose of the Study:

  • To precisely measure rotationally induced differential position displacements.
  • To achieve quantum-limited sensing of spatially correlated signals.
  • To constrain semiclassical models of nonlocally coherent spacetime rotational degrees of freedom.

Main Methods:

  • Utilized a pair of colocated 39m long, high-power Michelson interferometers.
  • Bent one arm of each interferometer 90° to sense rotations about a specific axis.
  • Operated the instrument in a broad frequency band beyond the 3.9-MHz inverse light travel time.

Main Results:

  • Achieved quantum-limited sensing of rotationally induced differential position displacements.
  • Demonstrated sensitivity to rotation-induced strain (h) surpassing CSD_{δh}10 kHz).
  • Exceeded sensitivity thresholds relevant to the Planck time (tP).

Conclusions:

  • The measurement provides constraints on semiclassical models of spacetime's rotational degrees of freedom.
  • Findings are relevant to theories of holographic quantum geometry.
  • The experiment advances the capability to probe potential deviations from classical metric theories.