High Energy Theory Seminar

Quantum reference frames (QRFs) provide a framework for describing physical systems relative to quantum observers, thereby rendering notions such as superposition, entanglement, and even subsystem structure observer-dependent. In this talk, I will discuss how QRFs provide insights into quantum aspects of spacetime and gravity, focusing on applications to non-classical spacetimes and to recent results on observer-dependent entanglement entropy. In particular, I will show how information trade-offs between multiple quantum reference frames place quantitative limits on how much the entropy assigned to a system of interest can vary between observers, both for ideal and non-ideal frames. This has potential implications for observer-dependent entropy assignments in gravitational settings.

Contact [email protected] for Zoom information.