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Enhancing Gravitational Interaction between Quantum Systems by a Massive Mediator.

Julen S Pedernales1, Kirill Streltsov1, Martin B Plenio1

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Testing quantum gravity requires overcoming the weak gravitational force. This study proposes using a massive mediator to amplify gravitational interactions, making quantum gravity experiments more feasible with smaller test masses.

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Area of Science:

  • Quantum physics
  • Gravitational physics
  • Experimental physics

Background:

  • Feynman proposed testing quantum gravity by observing gravitational interactions of masses in superposition.
  • Current experiments face challenges due to the extreme weakness of gravity, requiring highly squeezed initial states and small masses.

Purpose of the Study:

  • To propose a method to overcome the challenge of weak gravitational interaction in quantum gravity experiments.
  • To reduce the stringent requirements on test system mass and delocalization.

Main Methods:

  • Utilizing a massive body as an amplifying mediator for gravitational interactions between two test systems.
  • Analyzing the effective interaction strength mediated by the massive body.

Main Results:

  • The effective gravitational interaction between test systems increases with the mediator's mass.
  • The interaction strength is independent of the mediator's initial state and temperature.
  • This approach significantly lowers the demands on the test systems' mass and delocalization.

Conclusions:

  • The proposed mediator method enhances gravitational interaction, making quantum gravity experiments more experimentally accessible.
  • This advancement brings the experimental verification of quantum gravity effects closer to reality.