An Unruh-DeWitt detector interacting with a position-superposed BTZ black hole produces outcome probabilities containing a nonclassical contribution that distinguishes quantum superposition from classical mixtures, arising from singularities in the probed spectrum.
Hodgkinson, Particle detectors in curved spacetime quantum field theory (2013), arXiv:1309.7281 [gr-qc]
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Particle detector in a position-superposed black hole spacetime
An Unruh-DeWitt detector interacting with a position-superposed BTZ black hole produces outcome probabilities containing a nonclassical contribution that distinguishes quantum superposition from classical mixtures, arising from singularities in the probed spectrum.