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Quantum Superposition of Massive Objects and the Quantization of Gravity

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Title
Quantum Superposition of Massive Objects and the Quantization of Gravity
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30
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CC Attribution - NonCommercial - NoDerivatives 4.0 International:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Release Date2021
LanguageEnglish

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Abstract
When a massive quantum body is put into a spatial superposition, it is of interest to consider the quantum aspects of the gravitational field sourced by the body. In this talk, I will discuss a Gedankenexperiment where Alice and Bob control masses in quantum superposition. I will show that the analysis of this experiment does not lead to any inconsistency provided the gravitational radiation is quantized and that vacuum fluctuations limit the localization of a particle to no better than a Planck length. This provides support for the view that (linearized) gravity should have a quantum field description and that table-top experiments testing entanglement of systems interacting via gravity do probe the quantum nature of gravity, even if no ``gravitons'' are emitted during the experiment.
Keywords
German
German
English
English