Seed Seminar

Theoretical Physics

Observable-projected ensemble

by

Sara Murciano

on  June-18-2025, 12:00 ! Livein  Spin systems and phases of matterfor  60min
Abstract:

Local measurements in many‐body quantum systems can produce surprising phenomena—from preparing long‐range entangled states to driving measurement‐induced phase transitions and modifying critical behavior. In this talk, I will introduce a new “observable‐projected” protocol: rather than performing complete projective measurements on the complement of a subsystem, we measure a single, local Hermitian operator on part of that complement. The result is a mixed‐state ensemble on the subsystem that remains analytically tractable within a conformal field theory framework. I will then show how this ensemble’s entanglement structure can be computed, and present a detailed case study of the free compact boson.

 All talks  Summer '25: Spin systems and phases of matter