Recent Trends In HEP: Quantum Observables for Collider Physics
I've noticed a growing trend in HEP about Calculating quantum information tools at high energy colliders and I'm trying to understand what's actually going on. https://indico.cern.ch/event/1603106/timetable/
QFT computes scattering amplitudes and cross sections from Feynman diagrams — essentially, how often a process happens. Quantum information computes things like entropy, entanglement, Bell Inequality violation, and concurrence for the quantum state of the outgoing system in the same scattering process. These feel like two very different questions being asked about the same event.
1)Aren't these just two separate toolkits? Why should cross-section physics care about entanglement or Bell violation at all?
2)What's actually being connected here? Is QI revealing information that was always hiding inside the amplitude but got thrown away in a standard cross-section calculation, or is it something genuinely new?
3)When we compute these QI variables at colliders, what are we actually probing? Is there new physics sensitivity here, or is it more a proof-of-concept that QI ideas can be measured at a collider?