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The Bose-Marletto-Vedral (BMV) experiment is a proposal for a table-top experiment that addresses the question of the quantum nature of gravity and lies within current experimental reach. Two masses are each placed in a superposition of two locations and interact only via the gravitational field. If this leads to entanglement between the two masses, the BMV experiment would witness non-classical features of the gravitational field. We show that in the linear regime of gravity, not only the scalar mode of gravity must be quantized, but also the gravitomagnetic vector modes. This follows from an argument based on special relativistic invariance and is necessary for a consistent description of entanglement in different inertial frames of reference. Furthermore, we show that entanglement in accelerated frames of reference could differ from that in stationary frames. In this context, we discuss an adapted version of Bell’s spaceship paradox.

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Antonia Weber, ETH Zürich/Oxford
Seminar Room 0.02, ETP
Contact: Dmitry Bagrets