讲座嘉宾：石弢 研究员

讲座题目：Many-body Quantum Phases in Micro-wave Shielded Polar Molecules

讲座时间:   2025年12月12日（星期五）上午10：00

讲座地点：大讲堂圆弧报告厅

讲座摘要：

We show that the effective interaction potential between microwave-shielded polar molecules consists of an anisotropic van der Waals-like shielding core and a modified dipolar interaction. This effective potential is validated by comparing its scattering cross-sections with those calculated using intermolecular potential involving all interaction channels. It is shown that a scattering resonance can be induced under microwave fields and a field-link tetramer bound state emerges. With the effective potential, we further study the Bardeen-Cooper-Schrieffer pairing, Bose-Einstein condensations, and supersolid phases in microwave-shielded molecular gas. We show the fermionic superfluid critical temperature drastically enhanced near the resonance, a formation of self-bound droplets with reduced condensate fraction resembling a magnified Helium 4, and a formation of supersolidity controlled by the microwave elliptical angle.

个人简介：

石弢，南开大学物理学学士，中国科学院理论物理研究所博士，马克斯·普朗克量子光学研究所博士后。现任中国科学院理论物理研究所研究员，博士生导师，青年科学基金项目(A类)获得者。在Nature、PRX、PRL、PNAS、和Phys. Rev.发表文章70余篇。研究方向为：光与物质相互作用理论、冷原子分子物理、和凝聚态物理。

讲座嘉宾：常越 副研究员

讲座题目：Multi-photon emission from cooperative resonant emitters

讲座时间:   2025年12月12日（星期五）上午11：00

讲座地点：大讲堂圆弧报告厅

讲座摘要：

Atom–photon interactions play a central role in the generation of nontrivial multiphoton states, with implications spanning from fundamental quantum physics to emerging quantum technologies. Phenomena such as superradiance and subradiance—where collective atomic emission is enhanced or suppressed—highlight the rich dynamics arising from cooperative effects. In this talk, I will present our recent theoretical investigations into multiphoton emission from interacting quantum emitters. Two main results will be emphasized: first, the demonstration of chiral multiphoton dynamics in the non-Markovian regime using a giant system; and second, the characterization of collective emission involving tens of photons from a one-dimensional emitter array. I will conclude by outlining future directions and perspectives for advancing this line of research.

个人简介：

常越，现为北京量子信息科学研究院副研究员。报告人2006年本科毕业于于中山大学，2011年于中国科学院理论物理研究所获得博士学位（导师：孙昌璞），之后在Max-Planck Institute of Quantum Optics从事博士后研究工作（合作导师: J. Ignacio Cirac）直至2017年。报告人长期从事量子光学和量子精密测量方面的工作，已在Nature Photonics，PRL, PRA等期刊上发表数十篇文章。