Day 1 Dec-2 2021
Session 2 17:15-18:00

Experimental simulation of PT-symmetric quantum system using single trapped ion

† Ding, L.Y., † Shi, K.Y., † Zhang, Q.X., † Shen, D.N., †, ‡ Zhang, X., †, ‡* Zhang, W.
† Department of Physics, Renmin University of China, Beijing, China
‡ Beijing Academy of Quantum Information Science, Beijing, China

Exceptional points (EPs) of a non-Hermitian Hamiltonian with parity-time-reversal (PT) symmetry have the potential to drastically enhance the capabilities of metrology and sensing through their power-law growing sensitivity to external perturbation. With the ability of generating and tuning dissipation in a single trapped ion system, we observe rich dynamics and detailed quantum phase transitions from the PT-symmetric phase to the symmetry-breaking phase. In this single qubit full quantum system, we develop a method to precisely determine the location of EP without any fitting parameter, and extract the eigenvalues in a unified way through all parameter regions. We can also obtain the full density matrix by quantum state tomography. Finally, we suggest from theoretical analysis that the periodically driving PT-symmetric non-Hermitian system can be used to measure the magnitude, frequency and phase of time-dependent perturbation with EP enhancement.

Dr. Wei Zhang received his doctoral degree in School of Physics at Georgia Institute of Technology in 2006. After graduation, he worked as a Research Fellow in University of Michigan, and then joined Department of Physics at Renmin University of China in 2008. In 2014, Dr. Zhang was promoted to full professor. Dr. Zhang has been working in the field of atom, molecule and optic physics in the past few years, particularly focusing on quantum computation with trapped ion, as well quantum many-body effects and exotic quantum states in various experimental systems and important theoretical models.