Speaker
Description
Recent advances in programmable quantum systems have made it possible to monitor and control many-body states at the single-quantum level. In this talk, I shall discuss how quantum measurements open new frontiers at the interface of many-body physics and quantum information. I will first introduce how measurement backaction leads to intriguing many-body phenomena in open systems, such as measurement-induced entanglement transitions and criticality. I will then turn to many-body quantum resources, focusing on quantum magic, as a resource for universal quantum computation. By formulating stabilizer Rényi entropy as a participation entropy in a doubled Hilbert space, I will explain how many-body magic can be viewed as a property of quantum states under Bell measurements. This perspective enables a boundary conformal field theory analysis of universal magic scaling in one-dimensional critical states, including systems with periodic boundaries, open boundaries, and topological defects. I will also highlight how universal subleading terms are governed by boundary entropies, scaling dimensions, and defect fusion rules.