After his visit to UCLA (link here), Paul Bergold headed east and visited the Wisconsin Quantum Institute at the University of Wisconsin in Madison. His host there was Prof Micheline Soley. Paul gave a talk on Monday 16 October on his new Koopman method for simulating mixed quantum-classical dynamics that he has been working on with Cesare Tronci. The title of his talk was “Bridging the Quantum-Classical Divide in Molecular Dynamics: The Koopman Method” (event page here). After that Paul travelled to New Haven Connecticut, where he spent three days in Prof Batista’s group at Yale. On Friday, 20 October, he gave another presentation on his Koopman method. Victor invited John Tully, Sterling Professor emeritus of Chemistry (wiki page here) to the talk. Prof Tully developed the famous surface hopping algorithm (a mixed quantum-classical method that incorporates quantum mechanical effects into molecular dynamics) and proposed the so-called Tully models, which are now well-known benchmark models and are used to test simulations for different scenarios of non-adiabatic processes in quantum chemistry. Cesare and Paul use the Tully models to probe their new hybrid method, and Paul said it was a great honour for him to present his results directly to Prof. Tully. The first photo below shows Paul with Prof Soley, and the second photo shows Paul with Prof Batista’s group, with Prof Tully on the far left.