Lorenzo Piroli

Measurement-induced phase transitions in hybrid quantum circuits

The advent of noisy-intermediate-scale quantum (NISQ) devices is opening new horizons for fundamental research. When viewed as experimental platforms for many-body physics, NISQ devices can be conceptualized as physical systems evolving according to discrete sequences of few-body unitary processes, local projective measurements, and feedback. These ingredients may give rise to new universal phenomena out of equilibrium, such as the recently discovered entanglement measurement-induced phase transitions (MIPTs). In the first part of the talk, I will provide an overview of the literature on the subject, introducing models of random quantum circuits and MIPTs in the context of many-body physics. In the second part of the talk, I will present recent work focusing on explicit models, showing either interesting new phenomenology or allowing for analytic insight based on mappings to problems in statistical mechanics.