Article
Physics, Multidisciplinary
V. Bharti, S. Sugawa, M. Mizoguchi, M. Kunimi, Y. Zhang, S. de Leseleuc, T. Tomita, T. Franz, M. Weidemueller, K. Ohmori
Summary: This study reports the observation and control of ultrafast many-body dynamics of electrons in ultracold Rydberg-excited atoms. The emergence of many-body correlations and the crucial role of quantum fluctuations in the observed dynamics are deduced from time-domain Ramsey interferometry in the picosecond timescale.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
R. Wang, J. Sous, M. Aghigh, K. L. Marroquin, K. M. Grant, F. B. V. Martins, J. S. Keller, E. R. Grant
Summary: Out-of-equilibrium, strong correlation in a many-body system can trigger emergent properties that act to constrain the natural dissipation of energy and matter. This study focuses on the initial stages of avalanche and quench in a state-selected Rydberg gas to characterize intermolecular interaction dynamics using mm-wave spectroscopy.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Yann Kiefer, Max Hachmann, Andreas Hemmerich
Summary: Quantum gas systems are used to study the transition between Bose-Einstein condensed molecular pairs and Bardeen-Cooper-Schrieffer superfluidity. Previous studies in optical lattices focused on the lowest Bloch band, excluding orbital degrees of freedom. In this study, ultracold Feshbach molecules of fermionic atoms are prepared in the second Bloch band of an optical square lattice. The preparation covers a wide range of interaction strengths and demonstrates the interplay between orbital physics and the crossover of Bose-Einstein condensation and Bardeen-Cooper-Schrieffer superfluidity.
Article
Physics, Multidisciplinary
C. J. Turner, J-Y Desaules, K. Bull, Z. Papic
Summary: The text explains key concepts and findings in the theory of quantum scarring, demonstrating that quasimodes arise from previously established periodic orbits when quantum fluctuations are restored. The results shed light on the role of the TDVP classical system in Rydberg atom chains and its impact on the system.
Article
Optics
Chi-En Wu, Teodora Kirova, Marcis Auzins, Yi-Hsin Chen
Summary: In this theoretical study, the enhancement of the Rydberg blockade radius using Forster resonance is presented. The investigation reveals that significant differences in the principal quantum numbers of two Rydberg states can substantially improve the blockade radius, exceeding 50 μm.
Article
Optics
Donghao Li, Guoqi Bian, Jie Miao, Pengjun Wang, Zengming Meng, Liangchao Chen, Lianghui Huang, Jing Zhang
Summary: The study reports the measurement of the Rydberg excitation spectrum in ultra-cold (40K) Fermi gases through a two-photon process. Two methods were employed, one to reduce atomic losses using electromagnetically induced transparency, and the other to enhance losses through spontaneous avalanche ionization due to strong Rydberg-Rydberg interactions. The highest detectable Rydberg states were limited to n <= 62 due to competition between the long Rydberg blockade effective range and limited atomic cloud size.
Article
Physics, Multidisciplinary
Liping Hao, Zhengyang Bai, Jingxu Bai, Suying Bai, Yuechun Jiao, Guoxiang Huang, Jianming Zhao, Weibin Li, Suotang Jia
Summary: An ensemble of excited atoms can synchronize emission of light collectively in a process known as superradiance, which is strongly influenced by the surrounding electromagnetic fields. Enhanced by microwave photons from blackbody radiation, superradiance of Rydberg atoms is observed and studied, providing insights into collective photon-atom interactions and potential applications in blackbody thermometry.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
Jinzhu Jiang, Jia-Hui Zhang, Feng Mei, Zhonghua Ji, Ying Hu, Jie Ma, Liantuan Xiao, Suotang Jia
Summary: The recent experimental realization of optical tweezer arrays of ultracold molecules has provided a versatile platform for exploring different molecular phases of matter. By programming tweezers, researchers have been able to tailor dipolar interactions in an optical tweezer ladder to implement a generalized Su-Schrieffer-Heeger model, leading to the discovery of various chiral and interacting topological phases with richer topological edge states. Detection and robustness of these topological phases have also been discussed.
Article
Optics
Guoqi Bian, Biao Shan, Lianghui Huang, Jing Zhang
Summary: This study reports the measurement of electromagnetically induced transparency (EIT) using Rydberg states in ultracold Fermi gases. By studying the line shapes and peak position shift of Rydberg-EIT, we demonstrate significant changes and interaction behaviors of Rydberg states.
CHINESE OPTICS LETTERS
(2023)
Article
Optics
Yuechun Jiao, Liping Hao, Jingxu Bai, Jiabei Fan, Zhengyang Bai, Weibin Li, Jianming Zhao, Suotang Jia
Summary: In this experiment, we study the Rydberg electromagnetically induced transparency (EIT) of a cascade three-level atom involving the 80D(5/2) state in a strong interaction regime using a cesium ultracold cloud. We observe a slow decrease in EIT transmission over time at two-photon resonance, indicating interaction-induced metastability. The dephasing rate is found to have a nonlinear dependence on the incident photon number. The main dephasing mechanism is attributed to strong dipole-dipole interactions and state transfer to other Rydberg states.
Article
Multidisciplinary Sciences
Tomasz Swislocki, Mariusz Gajda, Miroslaw Brewczyk, Piotr Deuar
Summary: The study identifies two different mechanisms for spin distillation in Cr-52 and No-23 atoms, involving dipolar scattering and equilibrium relaxation of the thermal cloud. Through numerical simulations, it is demonstrated that the spin distillation cycle can be repeated multiple times, resulting in significant reduction of the thermal atom fraction. Threshold values of magnetic field and predictions for achievable temperature are also identified.
SCIENTIFIC REPORTS
(2021)
Article
Quantum Science & Technology
Kenneth Wang, Conner P. Williams, Lewis R. B. Picard, Norman Y. Yao, Kang-Kuen Ni
Summary: This study presents a quantum information architecture utilizing an array of optically trapped molecules and atoms. By taking advantage of the large transition dipole moments of Rydberg atoms, fast and high-fidelity gates between qubits encoded in coherent molecular degrees of freedom can be achieved. The paper discusses potential error channels and also explores the possibility of nondestructive molecule detection and rotational state readout through the molecule-Rydberg interaction.
Article
Optics
Cheng Chen, Fan Yang, Xiaoling Wu, Chuyang Shen, Meng Khoon Tey, Li You
Summary: The experimental observation of strong two-color optical nonlinearity in an ultracold gas of Rb-85 - Rb-87 atom mixture is reported. The nonlinearity can be tuned by varying the density ratio of different atomic isotopes, demonstrating potential for exploring strongly interacting multicomponent fluids of light. The phenomenon is described by two coupled nonlinear wave equations developed to explain the cross-absorption modulation to the beam propagation dynamics.
Article
Optics
Yuechun Jiao, Liping Hao, Jiabei Fan, Jingxu Bai, Jianming Zhao, Suotang Jia
Summary: We observed the autoionization of cesium 37D(5/2) Rydberg atoms in ultracold gases and analyzed the autoionization mechanism. By varying the delay time tD and Rydberg atomic density, we investigated the autoionization process. The results showed that the Rydberg density not only affected the initial ion signals but also influenced the evolution of the Rydberg atoms. Our study revealed that the initial ionization of 37D(5/2) Rydberg atoms was mainly due to blackbody radiation-induced photoionization and transitions to nearby Rydberg states induced by blackbody radiation, leading to further ionization.
Article
Optics
A. R. Perry, S. Sugawa, F. Salces-Carcoba, Y. Yue, I. B. Spielman
Summary: In this study, the multiple-camera off-resonance defocused (McORD) imaging method is adopted to improve the measurement of column density by eliminating the need for regularization. Experimental results demonstrate that the statistical uncertainties of the McORD method are competitive with absorption and phase-contrast imaging techniques.