Time: 09:30am (UTC/GMT+08:00, Beijing/Shanghai), Apr. 8 (Wedn.), 2020

Online Meeting Room (zoom.com): click here to join the meeting

Meeting ID: 538 432 998

Speaker: Xiang Zhang (Associate Professor,  Renmin University of China)

Abstract:

There are a lot of different physical systems that can be used as platforms to implement quantum computers. However the experimental realization of a practically useful quantum computer is still extremely challenging. Trapped ion system is one of the most promising architectures for a scalable, universal quantum computer mainly because of its high fidelity of fundamental operations, long coherence of qubits, and scalability for the large quantum system. Here several experimental improvements are made to get most out of this system, including a general quantum circuit compiler which maps arbitrary quantum algorithm to an optimal experimental sequence, a bottom-up system simulation toolset to find out optimal trap parameters, a cryogenic segmented trap design to improve trapped ions lifetime, several new addressing schemes to increase individual controllability, all digital stabilization circuits and fully integrated automatic control system to ensure scalability and robustness and enable fast iterative and incremental development. Then several quantum computation and simulation experiments demonstrated on our trapped ions system will be introduced,  including an experimental test of quantum contextuality in a three-level system (qutrit) by observing the violation of the Kochen-Specker (KS) inequality, an experimental quantum chemistry computation on the electronic structure of a molecular ion (HeH+) with the unitary coupled cluster (UCC) method,  and quantum simulation of some models by indirect mapping, such as Majorana equation, interacting quantum field modes, and PT-symmetric non-Hermitian systems.