The equivalence principle and inertial-gravitational decoherence

Understand

This work is divided into two parts.

• The first examines recent proposals for "witnessing" quantum gravity via entanglement from the point of view of Bronstein's original objection to a quantization of gravity.
• Using techniques from open quantum systems we sketch how unavoidable decoherence from both inertial and gravitational backreaction between probe and detector could spoil the experimental detection of the quantization of gravity.
• We argue that this "failure" is actually an inherent feature of any quantum description that attempts to incorporate the equivalence principle exactly within quantum dynamics.