1. When Ms. Topology meets Mr. Bath

Jungyun Han


25 September 2020 Fri 3 pm

                                      IBS Center for Theoretical Physics of Complex Systems (PCS), Administrative Office (B349), Theory Wing, 3rd floor

                                      Expo-ro 55, Yuseong-gu, Daejeon, South Korea, 34126 Tel: +82-42-878-8633                     

The era of quantum technologies brings huge innovations in science and technologies. The core principle lied behind is quantum coherence which is quite fragile against fluctuations. Topological invariant in the physical system can provide the shield against disorder in a closed system, but it is unknown for thermal non-equilibrium. In this talk, I will address the plan of studying topological invariant in the open quantum system to achieve dissipative free quantum information processing. As roads to the goal, I will introduce the work I have done so far. First, I will discuss disorder resistant transport in quasi one-dimensional photonic array thanks to the topological phase. Secondly, I will report the role of thermal bath in heat current in the nonlinear quantum system. After that, based on the knowledge from previous works, I will propose two main questions to investigate during PhD: 1. How the topological phase varies in the presence of thermal fluctuation? 2. Can we define topological invariant in the open system? To answer these, I will point out the distinction in transport using Su-Schrieffer-Heeger (SSH) model first and suggest the idea on topological invariant in non-equilibrium by summarizing previous works on equilibrium.