Work

When can gravity path-entangle two spatially superposed masses?

Year: 2018

Type: article

Abstract: An experimental test of quantum effects in gravity has recently been proposed, where the gravitational field's ability to entangle two masses is used as a witness of its quantum nature. Here, we discuss what existing models for coupled matter and gravity predict for this experiment. Collapse-type models, and also quantum field theory in curved spacetime, as well as various induced gravities, do not predict entanglement generation; they would, therefore, be ruled out as fundamental descriptions of gravity if entanglement were observed. Instead, local linearized quantum gravity models predict that the masses can become entangled. We analyze the mechanism by which entanglement is established in such models, modeling a gravity-assisted two-qubit gate.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.98.046001

Authors: Chiara Marletto, Vlatko Vedral

Institutions: Centre for Quantum Technologies, Institute for Scientific Interchange, National University of Singapore, University of Oxford

Language: English

Topic: Noncommutative and Quantum Gravity Theories

Subfield: Statistical and Nonlinear Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Research Foundation Singapore, Templeton World Charity Foundation

Award: G102927845