Classical vs Quantum Fields in Relativistic Quantum Information Protocols. Can Classical Gravity Entangle Two Quantum Systems?

In this talk we discuss the differences in quantum information protocols that are implemented via quantum fields or classical fields.

We find that quantum fields have an intrinsic noise which is detrimental to both communication and entangling channels, making classical fields better at implementing quantum information protocols whenever the source and emmiter are casually connected.

On the other hand, when the systems involved in the protocol are casually disconnected, only a quantum field is able to entangle them. We then apply these ideas to the recent proposals to witness quantum gravity in tabletop experiments, in order to check which quantum properties of the gravitational field could be tested by these experiments.