= Sougato Bose
{c}
<Sougato Bose> and collaborators proposed a spin-based witness for gravitationally induced <quantum entanglement>. Their 2017 design places two small masses in neighbouring matter-wave interferometers, with an embedded <spin> in each mass providing a correlation readout.<A Spin Entanglement Witness for Quantum Gravity by Sougato Bose and others>[Abstract: interferometric paths, gravitational phases and spin-correlation witness]{ref}
Different branch separations acquire different gravitational phases, potentially entangling the two systems. Competing electromagnetic forces and decoherence must be controlled before attributing a witness signal to gravity. The contribution is a proposed experimental strategy, rather than a claim that the experiment had already measured quantum gravity.
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