Experimental Observation of Gravitational Bremsstrahlung: A Quantum Protocol using Levitated Nanodiamonds and Ultra-Relativistic Hadrons

AbstractThis work details an experimental protocol for the direct observation of quantumgravitational radiation (graviton emission). The experiment is based on the ”graz-ing” interaction between ultra-relativistic hadron beams and an array of levitatednanodiamonds. By integrating the spin-detection technique of Hoang et al. (2016)with the fundamentals of gravity-mediated entanglement (Bose, 2017; Marletto,2017), we propose a protocol that isolates the quadrupolar (spin-2) signature ofgravity from electromagnetic dipolar (spin-1) noise. The success of this experimentwould provide the first direct evidence of the corpuscular nature of gravity throughdetection windows synchronized with high-energy accelerator infrastructure.We pro-vide estimates for the event rate (∼1-5 Hz) and a hybrid shielding strategy to ensurefeasibility within high-energy accelerator environments.