学术报告（12月28日 9：30—10: 30）

主持人：刘进教授

欢迎广大师生前来参与！

【摘要]】

Quantum computers hold the promise to solve certain problems exponentially faster than their classical counterparts. Trapped atomic ions are among the physical systems in which building such a computing device seems viable. In this talk I shall present a small-scale quantum information processor based on a string of 40Ca+ ions confined in a macroscopic linear Paul trap.

Two projects are involved in my talk. The first topic here pursues quantum chemistry simulation and the second explores dynamical phase transitions. In the former, we implement a parametrized, gate-based sequence corresponding to an approximated Hamiltonian of two simple molecules - molecular hydrogen (H2) and lithium hydride (LiH) and determine the potential energy curve describing the molecular bond between the constituent atoms. For the second direction, we investigate dynamic quantum phase transitions (DQPTs) in a string of ions simulating interacting transverse-field Ising models, and observed non-equilibrium dynamics induced by a quantum quench. DQPT extends the concept of phase transitions to the non-equilibrium regime, where physical quantities show nonanalytic behavior as a function of time. Our results provide a general approach towards experimentally accessing unifying principles of quantum many-body dynamics.

【报告人简介】

Dr. Heng Shen obtained his PhD degree in 2015 in Niles Bohr Institute at Copenhagen University, under the supervision of Prof. Eugene Polzik. His PhD work is focused on spin squeezing and entanglement with room temperature atoms, main results including high performance quantum magnetometer, Deterministic quantum teleportation between distant atomic objects. Afterwards, he moved to Rainer Blatt’s group as a postdoctoral research associate Institute for Quantum Optics and Quantum Information Austrian Academy of Sciences. The new field is quantum simulation based on trapped ions, main completed projects including quantum chemistry simulation and dynamical phase transitions. In this year, he received the Newton International Fellowship to move to Oxford University as a researcher assistant, mainly focus on Quantum state engineering of hybrid spin-mechanical quantum systems.