F. Giacomini - Quantum superposition of massive objects and the nature of gravity in quantum theory
Автор: Barrio RQI
Загружено: 2022-09-19
Просмотров: 386
Talk delivered for the Relativistic Quantum Information-North 2022 Online.
Abstract:
Recently, table-top experiments involving massive quantum systems have been proposed to test the interface between quantum theory and gravity. I will first analyse a Gedankenexperiment in which entanglement is generated via gravitational interaction between two quantum systems A and B. I will argue that, within a field-theoretic description of the gravitational field and in a Newtonian regime, it is necessary to include in the description some quantum features of gravity (vacuum fluctuations and emission of quantised radiation) to avoid faster than light signalling. I will then present a no-go theorem, which holds independently of the specific description of gravity and for general non-classical systems A and B, stating that the following statements are incompatible: i) gravity is able to generate entanglement; ii) gravity locally mediates the interaction between the non-classical systems; iii) gravity is classical. Finally, I will comment on the implications of the violation of each condition.
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