Quantum Stochastic Resonance in a Dissipative Rydberg Gas
Prof. Yi Wei
University of Science and Technology of China

I will discuss the collective response of a group of dissipative Rydberg atoms to a periodic modulation of the Rydberg excitation laser. The system intrinsically features collective-jump dynamics, where it stochastically switches between states with distinct Rydberg excitations.  The counting statistics of the state switching is qualitatively changed by the periodic drive, and the impact is most prominent when the driving frequency is comparable to the emergent collective-jump rate:  the jumps tend to synchronize with the external drive, and their counting statistics exhibits a series of suppressed subharmonics of the driving frequency. These phenomena are manifestations of a novel type of stochastic resonance, where a cooperative collective state switching is facilitated by quantum fluctuations in a many-body open system. The collective quantum stochastic resonance leads to an enhanced signal-to-noise ratio in the power spectrum of the Rydberg excitations, for which the synchronized collective jumps are viewed as the output signal. 

Reference: arXiv:2401.16894

About the Speaker

易为教授, 2000年于中国科学技术大学物理系获学士学位, 2007年获美国密歇根大学物理学博士学位, 2007年至2010年在奥地利因斯布鲁克大学理论物理所从事博士后研究。2010年5月始至今在中国科学技术大学中科院量子信息重点实验室工作。主要研究方向为超冷原子和量子模拟。

2024-03-18 10:00 AM
Room: A403 Meeting Room
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