날짜: 2021년 7월 14일 (수)  15:00 ~ 17:00

주제: SCQC 3차 정기 세미나

장소: Zoom 회의

-초청연사- 

채은미 (고려대학교)    15:00 - 16:00 

"A new quantum machine using ultracold molecules"  

 Due to their complex internal structures and strong long-range interactions, diatomic molecules are promising platforms for precision measurements, quantum simulations/computations, and quantum chemistry. Most of these experiments require ultracold temperatures and a general method of cooling is essential to fully exploit the diversity of molecular structures.

One route towards ultracold temperature is to cool the molecules directly, just as atoms, using laser cooling. Despite the additional internal structures present in molecules, there have been great successes in laser cooling of molecules during the last decade. After the realization of a magneto-optical trap (MOT), people can now manipulate ultracold molecules in a magnetic trap, an optical dipole trap, and optical tweezers. This has opened a new era of molecular research for quantum technology.

In this talk, a few experiments using ultracold molecules in optical tweezers will be introduced. I will first start with the CaF experiment at Harvard, where we engineer inelastic collisions between two molecules in optical tweezers by manipulating their quantum states. In the second part of the talk, a scheme to entangle two polar molecules using the electric dipole-dipole interaction will be discussed. At the end of the talk, I will also briefly introduce a new MgF experiment at Korea University.

김제형 (UNIST)    16:00 - 17:00

"Efficient control and measurement of solid-state quantum emitters" 

 Solid-state quantum emitters serve photonic and spin qubits, and therefore, they are becoming important hardware for quantum information processing. Atomically thin two-dimensional materials such as WSe₂ or MoS₂ are of great interest as emerging quantum emitters. The emitters in monolayers can efficiently out-couple photons and are easily integrated with photonic structures such as waveguides and cavities. Furthermore, the atomically thin monolayer has remarkable flexibility, and therefore the external strain significantly modifies the electronic and optical properties of the materials. Using these properties, they are capable of generating tunable and integrated quantum emitters based on 2D materials. In this seminar, I introduce recent developments of position- and frequency-controls of the solid-state quantum emitters and efficient optical interfaces with high resolution and high contrast.