Article
Chemistry, Multidisciplinary
Rong Song, Jingxu Bai, Yuechun Jiao, Jianming Zhao, Suotang Jia
Summary: This study accurately measured and analyzed the lifetimes of nS(1/2) and nD(5/2) cesium Rydberg states. The results showed that the room temperature blackbody radiation and interaction between Rydberg atoms have an impact on the lifetime, especially at higher Rydberg atomic densities.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Lorenzo Festa, Nikolaus Lorenz, Lea-Marina Steinert, Zaijun Chen, Philip Osterholz, Robin Eberhard, Christian Gross
Summary: This study investigates the state contamination and emerging pairwise interactions in optical tweezers at single atom resolution. It reveals characteristic correlations with a length scale set by the dipolar interaction and provides insights into the microscopic origin of avalanche excitation observed in previous experiments.
Review
Physics, Multidisciplinary
Florian Schreck, Klaasjan van Druten
Summary: Laser cooling is a crucial initial step for achieving Bose-Einstein condensation and quantum degeneracy in atomic gases, bringing them close to absolute zero. Ongoing development in laser cooling methods has enabled more elements to reach quantum degeneracy, leading to new experimental opportunities. Improved techniques like reaching Bose-Einstein condensation purely through laser cooling and continuous condensation are opening up new avenues for creating quantum gases.
Article
Spectroscopy
Huagang Xiao, Jiangnan Wang, Ruijie Zhang, Na Shan, Tao Gao
Summary: We theoretically investigate the possibility of laser cooling (SrCl)-Sr-87-Cl-35 molecule using vibrational and hyperfine spectroscopy. The potential energy curves and dipole moment are calculated, and the Franck - Condon factors and radiative lifetimes are predicted. The A(2)Pi(1/2) <-> X-2 Sigma(+)(1/2) transition is selected as the laser cooling cycle system, and the hyperfine spectroscopy and branching ratios are calculated.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Physics, Multidisciplinary
Y. Mei, Y. Li, H. Nguyen, P. R. Berman, A. Kuzmich
Summary: Researchers have created a special two-level system in an ensemble of several hundred atoms and observed oscillations between the ground state and collective Rydberg state. They have also obtained the light shifts of the qubits using interference techniques and derived an effective two-level model that agrees well with their observations.
PHYSICAL REVIEW LETTERS
(2022)
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
Physics, Multidisciplinary
Andrea Muni, Lea Lachaud, Angelo Couto, Michel Pokier, Raul Celistrino Teixeira, Jean-Michel Raimond, Michel Brune, Sebastien Gleyzes
Summary: This study demonstrates how to manipulate circular Rydberg states using the electrostatic coupling of strontium's valence electrons. It also shows the application of this coupling in non-destructive detection and the realization of a hybrid optical-microwave platform for quantum technology.
Article
Optics
Jiaqi Du, Ting Gong, Zhonghua Ji, Chenhao Wang, Yanting Zhao, Liantuan Xia, Suotang Jia
Summary: An all-optical method based on ladder-type EIT is demonstrated to measure the radiative lifetimes of ultracold cesium (Cs) Rydberg atoms. By detecting ground state atomic absorption with and without optical pumping, the population evolution of target Rydberg atoms can be reconstructed. The measured lifetimes of Cs atoms are consistent with theoretical calculations, showing the reliability of the method for studying light-matter interaction behavior.
Article
Thermodynamics
Hoang Thi Thanh Tam, Mana Toma, Takayuki Okamoto, Mio Hidaka, Kensuke Fujii, Yasuhiro Kuwana, Kotaro Kajikawa
Summary: This article reports the use of a highly transparent fluoropolymer LF for efficient daytime radiative cooling. LF is weatherable, solvent-soluble, and paintable, and its cooling effect stems from the vibrations of the carbon-fluorine bond. The study found that LF demonstrates high cooling efficiency in practical use.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
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
Physics, Multidisciplinary
Hao Wu, Shamil Mirkhanov, Wern Ng, Mark Oxborrow
Summary: By interacting with spin-polarized triplet states of pentacene molecules, thermal photons are temporarily removed from a room-temperature microwave mode, resulting in a decrease in noise temperature. This system has the potential to be used for low-noise detectors, quantum memory, and quantum-enhanced machines without the need for cooling equipment and vacuum chambers.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Deng Pan, Hongxing Xu, F. Javier Garcia de Abajo
Summary: The technique of Doppler cooling is used to laser cool atoms, molecules, and nanoparticles by exploiting the Doppler shift associated with translational motion. The rotational Doppler effect can enable optical manipulation of the rotational motion of nanosystems, with rich and unexplored physics including a strong dependence on particle morphology. Exciting possibilities are opened up to control the rotational motion of nanosystems through rotational Doppler cooling and heating effects.
Article
Chemistry, Physical
Amal Madi, Nayla El-Kork, Israa Zeid, Mahmoud Korek
Summary: The adiabatic potential energy curves of the low lying electronic states of Be halide anions (BeX-) have been studied using computational methods. The spectroscopic parameters and rovibrational behavior of these electronic states were investigated, and new electronic states were discovered. It was found that the BeF- molecular anion has potential for Doppler laser cooling.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Andrea Muni, Lea Lachaud, Angelo Couto, Michel Poirier, Raul Celistrino Teixeira, Jean-Michel Raimond, Michel Brune, Sebastien Gleyzes
Summary: This study demonstrates the coherent manipulation of circular Rydberg states using the electrostatic coupling between the two valence electrons of strontium and optical pulses. The state of the Rydberg electron can be mapped onto the ionic core, enabling non-destructive detection of circular states and the realization of a hybrid optical-microwave platform for quantum technology.
Article
Optics
Niccolo Bigagli, Daniel W. Savin, Sebastian Will
Summary: We present a scheme for laser cooling of C-12(2) and provide calculations for the branching ratios of cycling and repumping transitions. Our results show that C-2 cooling, using specific bands, is achievable under realistic experimental conditions. This work opens up possibilities for cooling molecules with carbon-carbon bonds and potentially enables quantum control of organic molecules.
Article
Physics, Multidisciplinary
William R. McGehee, Wenqi Zhu, Daniel S. Barker, Daron Westly, Alexander Yulaev, Nikolai Klimov, Amit Agrawal, Stephen Eckel, Vladimir Aksyuk, Jabez J. McClelland
Summary: Laser-cooled atoms are essential for calibration-free measurement platforms and promising for quantum applications, while planar optics, including photonic integrated circuits and optical metasurfaces, offer a pathway to develop chip-scale devices utilizing cold atoms. Efficient use of available light is achieved through metasurface-enabled beam shaping, enabling competitive performance with traditional Gaussian-beam illuminated setups.
NEW JOURNAL OF PHYSICS
(2021)
Article
Instruments & Instrumentation
J. L. Siegel, D. S. Barker, J. A. Fedchak, J. Scherschligt, S. Eckel
Summary: The research team designed a pair of symmetric Bitter-type electromagnet assemblies capable of producing multiple field configurations. By incorporating an innovative 3D-printed water distribution manifold, they achieved low thermal resistance and high water flow rate.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Computer Science, Interdisciplinary Applications
Stephen Eckel, Daniel S. Barker, Eric B. Norrgard, Julia Scherschligt
Summary: The Python computer program presented in this study simulates various aspects of laser cooling physics. Users can specify parameters and choose from different levels of approximation for computational efficiency. The software successfully reproduces well-known phenomena such as Rabi flopping, electromagnetically induced transparency, and optical molasses.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Instruments & Instrumentation
S. Eckel, D. S. Barker, J. Fedchak, E. Newsome, J. Scherschligt, R. Vest
Summary: We demonstrate a constant-pressure flowmeter capable of generating and accurately measuring extremely low flows. Through the use of small conductance element and low outgassing materials, the flow generation and measurement are achieved. The accuracy of the flowmeter is verified through the analysis of its hydraulic system and comparison with a standard flowmeter.
Review
Instruments & Instrumentation
Daniel S. Barker, Bishnu P. Acharya, James A. Fedchak, Nikolai N. Klimov, Eric B. Norrgard, Julia Scherschligt, Eite Tiesinga, Stephen P. Eckel
Summary: We describe the cold-atom vacuum standards (CAVS) under development at the National Institute of Standards and Technology (NIST). The CAVS measures pressure in the ultra-high and extreme-high vacuum regimes by measuring the loss rate of sub-millikelvin sensor atoms from a magnetic trap. Both the laboratory standard and portable version of CAVS are connected to a device that enables sensing of a known pressure of gas.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Quantum Science & Technology
Lucas H. Ehinger, Bishnu P. Acharya, Daniel S. Barker, James A. Fedchak, Julia Scherschligt, Eite Tiesinga, Stephen Eckel
Summary: This article compares two portable cold-atom vacuum standards (pCAVSs) based on ultracold Li-7 atoms. The study finds that the pCAVS devices show consistent measurements after a leak is fixed, and suggests that better thermal management can reduce additional outgassing.
AVS QUANTUM SCIENCE
(2022)
Article
Optics
E. B. Norrgard, D. S. Barker, S. P. Eckel, S. G. Porsev, C. Cheung, M. G. Kozlov, I. I. Tupitsyn, M. S. Safronova
Summary: This study reports the measured and calculated decay rates of the 3d(4)(D-5)4s4p(P-3(0)) y(7)P(2,3,4)(0) states of Cr I. The decay rates were measured with roughly 1% total uncertainty using time-correlated single-photon counting. Laser induced fluorescence was used to measure the isotope shifts between these states and the ground state with approximately 0.5% uncertainty. The decay rate calculations were conducted using a hybrid approach combining configuration interaction and the linearized coupled-cluster method (CI+all-order method). These measurements provide a much needed precision benchmark for evaluating the accuracy of the CI-Pall-order approach in complex systems and expand its applicability. Additionally, these measurements demonstrate the operation of a cryogenic buffer gas beam source for future cold molecule experiments.
Article
Optics
Eric B. Norrgard, Stephen P. Eckel, Christopher L. Holloway, Eric L. Shirley
Summary: In this study, the interaction between blackbody radiation and quantum systems is discussed. It is found that the photon number variance of a blackbody in thermal equilibrium leads to broadening of energy levels inversely proportional to the square root of the blackbody volume. However, even in small blackbody volumes, this effect is unlikely to significantly impact transition linewidths in Rydberg atoms and atomic clocks.
Article
Engineering, Electrical & Electronic
James A. Fedchak, Julia K. Scherschligt, Sefer Avdiaj, Daniel S. Barker, Stephen P. Eckel, Ben Bowers, Scott O'Connell, Perry Henderson
Summary: The study measured the water and hydrogen outgassing rates of seven vacuum chambers with identical geometry but constructed of different materials. It was found that titanium, aluminum, 316L-XHV, and 316LN-XHV chambers have the lowest hydrogen outgassing rates, making them excellent choices for ultrahigh vacuum and extreme-high vacuum applications depending on cost and other material properties.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2021)
