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This study proposes a laboratory experiment to test if gravity is quantum. Researchers show that gravitational interaction can entangle two masses, proving gravity acts as a quantum mediator.

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Area of Science:

  • Quantum physics
  • Quantum gravity
  • Experimental physics

Background:

  • Reconciling quantum mechanics and general relativity remains a major challenge.
  • Empirical evidence for quantum gravity is lacking, fueling debate on gravity's quantum nature.
  • Current experimental proposals struggle to test quantum gravity's coherent behavior.

Purpose of the Study:

  • To propose a feasible laboratory experiment to test the quantum nature of gravity.
  • To demonstrate that gravitational interactions can mediate quantum entanglement between masses.
  • To provide a method for experimentally certifying gravity as a quantum coherent mediator.

Main Methods:

  • Utilizing adjacent matter-wave interferometers with micron-sized test masses.
  • Analyzing the phase evolution induced by gravitational interaction between masses.
  • Designing a protocol for witnessing entanglement via spin correlation measurements.

Main Results:

  • Gravitational interaction between two micron-sized masses can induce detectable entanglement.
  • Entanglement is achievable even when masses are sufficiently separated to mitigate Casimir-Polder forces.
  • The proposed method allows for direct experimental certification of gravity's quantum mediating role.

Conclusions:

  • The experiment offers a direct pathway to test the quantum nature of gravity.
  • This work provides a concrete experimental blueprint for probing quantum gravity.
  • Successful implementation would resolve the debate on gravity as a quantum entity.