Gravitationally Induced Entanglement between Two Massive Particles is Sufficient Evidence of Quantum Effects in Gravity

All existing quantum-gravity proposals are extremely hard to test in practice. Quantum effects in the gravitational field are exceptionally small, unlike those in the electromagnetic field. The fundamental reason is that the gravitational coupling constant is about 43 orders of magnitude smaller than the fine structure constant, which governs light-matter interactions. For example, detecting gravitons-the hypothetical quanta of the gravitational field predicted by certain quantum-gravity proposals-is deemed to be practically impossible. Here we adopt a radically different, quantum-information-theoretic approach to testing quantum gravity. We propose witnessing quantumlike features in the gravitational field,…

• JT
  John Templeton Foundation
• NU
  National University of Singapore
• NR
  National Research Foundation Singapore

  Award: NRF- CRP14-2014-02
• TW
  Templeton World Charity Foundation
• EA
  Engineering and Physical Sciences Research Council
• OM
  Oxford Martin School, University of Oxford