Inference of gravitational field superposition from quantum measurements

Overstreet, Chris; Curti, Joseph; Kim, Minjeong; Asenbaum, Peter; Kasevich, Mark A.; Giacomini, Flaminia

doi:10.48550/arxiv.2209.02214

Cited by 1 publication

(1 citation statement)

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“…This is an exact mathematical analog of the infrared divergences that occur at null infinity in QED for processes with nonzero memory (see e.g., [33][34][35]). Now suppose that Alice displaces the particle a zdistance d D = 1/a from D to D = D+d as above, but instead of leaving the particle at D forever, she leaves it there for proper time 13 T and then returns it to D. In this case, the transverse components of the vector potential, A A , return to their initial values at late times, so there is no "memory effect" at the horizon. Correspondingly, there are no infrared divergences in the expected number of photons that propagate through H + R .…”

Section: Decoherence Due To Radiation Of Soft Photons/gravitons Throu...mentioning

confidence: 99%

Black holes decohere quantum superpositions

Danielson

Satishchandran

Wald

2022

Int. J. Mod. Phys. D

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We show that if a massive body is put in a quantum superposition of spatially separated states, the mere presence of a black hole in the vicinity of the body will eventually destroy the coherence of the superposition. This occurs because, in effect, the gravitational field of the body radiates soft gravitons into the black hole, allowing the black hole to acquire “which path” information about the superposition. A similar effect occurs for quantum superpositions of electrically charged bodies. We provide estimates of the decoherence time for such quantum superpositions. We believe that the fact that a black hole will eventually decohere any quantum superposition may be of fundamental significance for our understanding of the nature of black holes in a quantum theory of gravity.

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Section: Decoherence Due To Radiation Of Soft Photons/gravitons Throu...mentioning

confidence: 99%