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This study proposes a novel experiment to detect quantum gravity by measuring gravitational fields from spatial superpositions. The setup reveals nonclassicality through measurement-induced disturbance, independent of decoherence rates.

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Area of Science:

  • Quantum physics and gravity
  • Foundations of quantum mechanics
  • Experimental quantum mechanics

Background:

  • Classical systems allow measurement without disturbance, a stark contrast to quantum systems.
  • Distinguishing between classical and quantum behavior in gravity is a fundamental challenge.
  • Current experiments often rely on entanglement or specific nonclassical gravity theories.

Purpose of the Study:

  • To propose a novel experimental setup for detecting the nonclassicality of gravitational fields.
  • To test quantum mechanics in the context of gravity without requiring entanglement or specific nonclassical gravity models.
  • To identify a signature of quantum measurement-induced disturbance in gravitational measurements.

Main Methods:

  • Utilizing a multi-interferometer setup where one interferometer generates a spatial superposition.
  • Employing other interferometers to measure the gravitational field produced by this superposition.
  • Analyzing the measurement for irreducible disturbance indicative of quantum nonclassicality.

Main Results:

  • The proposed experiment can reveal nonclassicality in a gravitational field sourced by a spatial superposition.
  • The test detects quantum measurement-induced disturbance, even with finite decoherence rates.
  • The method is device-independent and does not require pre-existing entanglement.

Conclusions:

  • This experiment offers a new avenue for probing quantum gravity by focusing on measurement disturbance.
  • It expands the scope of quantum postulates being tested against gravitational phenomena.
  • The proposed test provides a robust signature of quantum effects in gravity, applicable across various experimental conditions.