SEMINAR 2022
Quantum algorithms to realize and study fractional Hall states and their dynamics on near term quantum computers: A tabletop experiment on quantum gravity.
| Speaker | A/Prof Pouyan Ghaemi, City College and Graduate Center of the City University of New York, USA |
| Host | Lee Ching Hua |
| Date | Wed, 31 Aug @ 9-10 am |
| Zoom link | https://nus-sg.zoom.us/webinar/register/WN_g4L36u8PQmyLw5xHtxMdJQ |
Abstract
Intermediate-scale quantum technologies provide unprecedented opportunities for scientific discoveries while posing the challenge of identifying important problems that take advantage of them through algorithmic innovations. Fractional quantum Hall systems are one suitable class of correlated electron systems with many interesting and puzzling properties. In this talk, I present an efficient quantum algorithm to generate a many-body state that is equivalent to Laughlin’s ν=1/3 fractional quantum Hall state on a digital quantum computer. Our algorithm only uses quantum gates acting on neighboring qubits in a quasi-one-dimensional setting, and its circuit depth is linear in the number of qubits. I then present another quantum algorithm to generate and study out-of-equilibrium properties of fractional quantum Hall states. Such features reveals novel geometric aspects of fractional Hall states which mimics gravitons.
References: PRX Quantum 1, 020309 (2020), Phys. Rev. Lett. 129, 056801 (2022)
Biography
Prof. Ghaemi finished his undergraduate studies in Sharif University of Technology, Tehran, Iran in 2003, and then obtained his PhD in Physics from MIT in 2008 under supervision of Prof. Todari. Senthil. The focus of his Ph.D. was on correlated electron systems such as cuprates and heavy-fermions, as well as quantum phase transitions in frustrated spin systems. Prof. Ghaemi then did a post-doc at U.C. Berkeley and Lawrence Berkeley National Lab from 2008 to 2011 with Ashvin Vishwanath and Joel Moore, working on pnictide superconductors and topological phases. Next, Ghaemi took on a fellowship at the Institute for Condensed Matter Theory at University of Illinois at Urbana-Champaign. There, he worked with theorists such as Eduardo Fradkin, Shinsei Ryu and Taylore Huse as well as many experimentalists.
Prof. Ghaemi became a faculty member at City College and Graduate Center of the City University of New York since January 2014, where he is currently an Associate Professor of Physics. One of his recent interests, which will be the topic of his talk, is the realization of novel phenomena in correlated electron systems on present-day Quantum Computers.