12th SmoleQ Greeting Seminar (2025.10.22 at 17:00 (JST))

 

Speaker: 

Isaac Layton

Title: 

Classical-quantum methods for open quantum systems

Abstract:

A wide range of systems in physics and chemistry are studied by  approximating part of the system as classical, while treating the rest  as quantum. However, naively coupling classical and quantum systems can  easily violate basic principles of both classical and quantum physics,  such as linearity and positivity. In this talk I'll describe how one may  derive consistent classical-quantum evolution laws directly from  quantum theory, using a quasiprobability representation on one  system. This provides a promising tool for studying complex open quantum  systems, that both reduces the computational complexity of simulation  and provides an intuitive picture of the effectively classical parts of a  quantum environment.