报告时间：10月30日 周二 下午3:00
报告人：Romain Long 教授 （法国LKB实验室）
报告题目： Towards Cavity-Based Entanglement of an Atomic Register Under a Microscope
Cavity Quantum Electrodynamics with cold atoms is one of the promising avenues to generate multi-particle entangled states, such as spin-squeezed states potentially useful for entanglement-enhanced metrology. Such experiments rely on the collective coupling of the atoms with a cavity mode while single-particle control is usually not implemented.
We will present our progress towards the generation of multi-particle entangled states of tens of the atoms by their interaction with an optical micro-cavity, while the detection and control of each individual atom will be provided thanks to a high-resolution microscope.
More specifically, we have developed a new generation of dual-wavelength high-finesse fiber Fabry-Perot cavity. Rubidium atoms are trapped in a one-dimensional lattice (at 1560 nm) along the cavity axis, allowing a maximal and identical coupling of all the atoms with a cavity mode resonant at the Rb atomic transition (780 nm). The resonator is placed at the focus of a high-NA lens, which will provide single-site resolution. Starting from a magneto-optical trap about 1 cm below the resonator, we load up to 2000 atoms in the cavity mode by transporting them in an ”atom elevator”. We will present the first signature of strong coupling between the atoms and the resonant cavity mode, as well as a cavity protection effect preserving small linewidth despite inhomogeneities.
The prospects to generate multi-particle entangled states with this experimental platform will be discussed.
Romain obtained his PhD in 2003 in the group of Serge Haroche at ENS in Paris, during which he also worked extensively in the group of Ted Haensch in Munich. He then worked with Mark Kasevich as a post-Doc at Stanford. He has been back in Paris ever since at the Kastler Brossel Laboratory of the ENS as an assistant professor in the group of Jakob Reichel till today.