Academy of Mathematics and Systems Science, CAS
Colloquia & Seminars

Speaker:	蔡振宁副教授，新加坡国立大学
Inviter:	邸亚娜副研究员
Title:	Inchworm Monte Carlo method for open quantum systems
Time & Venue:	2018.12.26 10:00-11:00 Z311
Abstract:	We investigate in this work a recently proposed diagrammatic quantum Monte Carlo method --- the inchworm Monte Carlo method --- for open quantum systems. We establish its validity rigorously based on resummation of Dyson series. Moreover, we introduce an integro-differential equation formulation for open quantum systems, which illuminates the mathematical structure of the inchworm algorithm. This new formulation leads to an improvement of the inchworm algorithm by introducing classical deterministic time-integration schemes. The numerical method is validated by applications to the spin-boson model.