Title：Ultracold trapped ions and molecules for quantum control

Speaker：Shiqian Ding，University of Colorad

Date：July 9, 2020 9:30 AM

Meeting Link：Tecent Meeting

https://meeting.tencent.com/s/BAOlzuh1Svnz

Meeting ID: 198 537 092

Abstract：Due to remarkable coherent control of ions’ motional and internal states, ion trap is one of the leading platforms for quantum computing. In the first part of my talk, I will discuss the nonlinear interaction of ions’ motional modes at the single-phonon level, induced by the intrinsic anharmonicity of the Coulomb interaction between the ions. I will present the applications of these nonlinear interactions for the measurement of the Wigner function, the projective measurement of phonon number, and quantum thermodynamics.

In the second part of my talk, I will describe our recent work on direct laser cooling and trapping of yttrium monoxide molecules to achieve the highest molecular phase space density in free space. We cool the molecules to 4 μK with gray molasses cooling, which is shown to be exceptionally robust against laser parameters and magnetic field. This work paves the way for applications of ultracold molecules for quantum computing, quantum chemistry, study of strongly correlated quantum systems, and precision tests of fundamental physics.