Article
Physics, Applied
Li-Hua Zhang, Zong-Kai Liu, Bang Liu, Zheng-Yuan Zhang, Guang-Can Guo, Dong-Sheng Ding, Bao-Sen Shi
Summary: The developing frequency-comb spectral technologies have potential applications and prospects in the wide fields of cosmology, meteorology, and microwave measurement. The demonstrated Rydberg microwave-frequency-comb spectrometer provides precise microwave measurement via multiple-microwave field dressing. This experiment enables real-time sensing of unknown microwave signals using Rydberg atoms.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
SongPo Xu, MingQing Liu, Wei Quan, XiaoPeng Yi, ShiLin Hu, LiBin Zheng, ZhiQiang Wang, Meng Zhao, ShaoGang Yu, RenPing Sun, YanLan Wang, LinQiang Hua, XuanYang Lai, Wilhelm Becker, Jing Chen, XiaoJun Liu
Summary: S-matrix theory and the Born expansion, particularly the second-order term, provide an effective theory for understanding atomic and molecular processes in intense laser fields. The convergence problem of the Born series arises when dealing with long-range potentials such as the Coulomb potential. By conducting experiments and simulations on an argon atom subjected to a strong laser field, we demonstrate that the second-order term of the S-matrix expansion can accurately reproduce the observed phenomena, while the lowest-order term cannot.
Article
Physics, Multidisciplinary
Yafen Cai, Shuai Shi, Yijia Zhou, Jianhao Yu, Yali Tian, Yitong Li, Kuan Zhang, Chenhao Du, Weibin Li, Lin Li
Summary: This study demonstrates a novel atom-based microwave field amplitude stabilizer using microwave-dressed Rydberg atoms, which features multi-band frequency tunability and large stabilization bandwidth. The stabilization bandwidth achieved is two orders of magnitude higher than previous methods and can potentially be further increased. This research paves the way for developing noise-resilient, miniaturized, sensitive, and broadband electric field control and applications.
FRONTIERS OF PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Nikolay V. Tkachenko, Pavel Rublev, Alexander I. Boldyrev, Jean-Marie Lehn
Summary: By coating Rydberg molecules with organic skin, their ionization potential energy can be further decreased and thermodynamic stability can be increased.
FRONTIERS IN CHEMISTRY
(2022)
Article
Optics
Chao Li, Guo Ma, Bao Wang, Xiao Jia, Shengzhao Wang
Summary: In quantum defect theory, the quantum defect converges to a constant value at high Rydberg series. Experimental results are often distorted by factors such as the shift of ionization limit, external magnetic fields, or external electric fields. The electric field correction to the quantum defect is small at low Rydberg states but increases rapidly at high Rydberg states, potentially exceeding the correction from the shift of ionization limit.
Article
Chemistry, Analytical
Zheng Yin, Qianzhu Li, Xiaoyun Song, Zhengmao Jia, Michal Parniak, Xiao Lu, Yandong Peng
Summary: A scheme for the measurement of microwave electric field using multi-photon coherence in Rydberg atoms is proposed, which shows a linear relationship between the magnitude of three-photon electromagnetically induced absorption (TPEIA) peaks and the microwave field strength. The minimum detectable strength of the microwave fields using this scheme is about 1/10 of that based on the common electromagnetically induced transparency (EIT) effect, and the probe sensitivity can be improved by about four times. This scheme seems to be robust against changes in the control field and has broad tunability, which may be useful for designing novel MW sensing devices.
Article
Optics
Jiabei Fan, Hanxiao Zhang, Yuechun Jiao, Changcheng Li, Jingxu Bai, Jinhui Wu, Jianming Zhao, Suotang Jia
Summary: We demonstrate the coherent microwave manipulation of a single optical photon by utilizing a single Rydberg excitation in an atomic ensemble. The strong nonlinearities in a Rydberg blockade region allow for the storage of a single photon in the form of a Rydberg polariton using electromagnetically induced transparency (EIT). By applying a microwave field, the stored single photon can be manipulated, while coherent readout is achieved by mapping the excitation into a single photon. Our experimental observations are well explained by numerical simulations based on an improved superatom model, and this work is significant for the development of quantum technologies.
Article
Optics
Zhuo Fu, Peng Xu, Yuan Sun, Yang-Yang Liu, Xiao-Dong He, Xiao Li, Min Liu, Run-Bing Li, Jin Wang, Liang Liu, Ming-Sheng Zhan
Summary: This article reports experimental results on the realization of a two-qubit controlled-PHASE (CZ) gate via single-modulated-pulse off-resonant modulated driving in rubidium (Rb) atoms. The gate operation is completed using a carefully calculated smooth waveform global driving laser pulse and combined with global microwave pulses to generate two-atom entanglement.
Article
Physics, Multidisciplinary
Ulrich Bengs, Serguei Patchkovskii, Misha Ivanov, Nickolai Zhavoronkov
Summary: The AC Stark shift of electronic levels caused by intense light fields interacting with atoms and molecules is a common phenomenon. In this study, we observed Stuckelberg oscillations in the intensity of coherent free-induction decay after resonant multiphoton excitation. By combining experimental results, numerical simulations, and a simple model, we used Stuckelberg oscillations to recover the population dynamics of strongly driven Rydberg states.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Feng-Dong Jia, Xiu-Bin Liu, Jiong Mei, Yong-Hong Yu, Huai-Yu Zhang, Zhao-Qing Lin, Hai-Yue Dong, Jian Zhang, Feng Xie, Zhi-Ping Zhong
Summary: The study introduces a method using auxiliary microwave-dressed Rydberg atoms to extend the measurement range of microwave electric field strength from several mV/cm to μV/cm. This method can improve the accuracy and sensitivity of microwave electrometry.
Article
Optics
Minghao Cai, Zishan Xu, Shuhang You, Hongping Liu
Summary: This study presents a theoretical and experimental investigation on the improvement and determination of the sensitivity of Rydberg atom-based microwave RF sensor. By setting up an optical Bloch equation, it is found that the sensitivity of the sensor is correlated with the amplitude strengths of the applied lasers and the RF, as well as the frequency detuning of the coupling laser. Experimental demonstration shows that optimizing these parameters can improve the sensitivity to 12.50(04) nVcm(-1).Hz(-1/)(2).
Article
Optics
L. Ortmann, C. Hofmann, I. A. Ivanov, A. S. Landsman
Summary: The study reveals that the duration of the laser pulse significantly affects the quantum number distribution of Rydberg states, thereby impacting the EUV yield for coherent high-frequency radiation. Analysis of electron trajectories identifies elastic recollision as the underlying cause of this change.
Article
Chemistry, Physical
Ivan Powis, Dhirendra P. P. Singh
Summary: The vibrationally structured 3p(z) Rydberg excitation at 6.31 eV in the VUV absorption spectrum of fenchone is identified and assigned, below the prominent 6.4 eV (C) over tilde band onset. However, this feature cannot be observed in (2+1) REMPI spectra due to its reduced excitation cross-section in a two-photon transition. Calculations of vertical and adiabatic Rydberg excitation energies, photon absorption cross-sections, and vibrational profiles provide support for these interpretations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Quantum Science & Technology
Mingzhi Han, He Hao, Xiaoyun Song, Zheng Yin, Michal Parniak, Zhengmao Jia, Yandong Peng
Summary: A scheme for measuring microwave electric fields using bichromatic electromagnetically induced transparency (EIT) in Rydberg atoms is proposed. The absorption spectrum of the excited state transition driven by a bichromatic control field shows three EIT windows. When a microwave field is applied, the EIT windows split and six transmission peaks appear. The distance between the transmission peaks in the spectrum is sensitive to the microwave field strength, allowing for the measurement of the microwave electric field.
EPJ QUANTUM TECHNOLOGY
(2023)
Article
Astronomy & Astrophysics
H. Liszt, M. Gerin
Summary: This study investigates the atomic or molecular character of the dark neutral medium (DNM) by observing 33 background continuum sources. The HCO+ absorption is detected in 28 new directions, and CO emission is observed in 19 of them. The research finds that the DNM is predominantly molecular.
ASTRONOMY & ASTROPHYSICS
(2023)
