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Authors = Anupam Mazumdar ORCID = 0000-0002-0967-8964

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10 pages, 380 KiB  
Article
Entanglement Witness for the Weak Equivalence Principle
by Sougato Bose, Anupam Mazumdar, Martine Schut and Marko Toroš
Entropy 2023, 25(3), 448; https://doi.org/10.3390/e25030448 - 3 Mar 2023
Cited by 29 | Viewed by 3520
Abstract
The Einstein equivalence principle is based on the equality of gravitational and inertial mass, which has led to the universality of a free-fall concept. The principle has been extremely well tested so far and has been tested with a great precision. However, all [...] Read more.
The Einstein equivalence principle is based on the equality of gravitational and inertial mass, which has led to the universality of a free-fall concept. The principle has been extremely well tested so far and has been tested with a great precision. However, all these tests and the corresponding arguments are based on a classical setup where the notion of position and velocity of the mass is associated with a classical value as opposed to the quantum entities.Here, we provide a simple quantum protocol based on creating large spatial superposition states in a laboratory to test the quantum regime of the equivalence principle where both matter and gravity are treated at par as a quantum entity. The two gravitational masses of the two spatial superpositions source the gravitational potential for each other. We argue that such a quantum protocol is unique with regard to testing especially the generalisation of the weak equivalence principle by constraining the equality of gravitational and inertial mass via witnessing quantum entanglement. Full article
(This article belongs to the Special Issue Optomechanical Systems for Fundamental Physics)
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