Article
Optics
D. Main, T. M. Hird, S. Gao, I. A. Walmsley, P. M. Ledingham
Summary: This study demonstrates coherent storage and retrieval of pulsed light using the atomic frequency comb protocol in room temperature alkali vapor. Multiple velocity classes in the ground state of cesium are prepared using velocity-selective optical pumping. Utilizing two transitions in the comb enhances recall efficiency through an interference effect upon rephasing.
Article
Engineering, Electrical & Electronic
Peng Peng, Wu Zhou, Lun Li, Jiangbo He, Bei Peng, Huijun Yu, Xiaoping He
Summary: This study investigates the drift of MEMS accelerometers stored at room temperature for one year through finite-element analysis simulation and experiments. A comprehensive FEA model is established to simulate the deformation of the sensor package structure, and drift models for the scale factor and bias of the accelerometer are built. The simulation results are validated through testing and recording the outputs of packaged accelerometers. The findings provide meaningful guidance for the application of MEMS accelerometers.
IEEE SENSORS JOURNAL
(2023)
Article
Optics
D. Main, T. M. Hird, S. Gao, E. Oguz, D. J. Saunders, I. A. Walmsley, P. M. Ledingham
Summary: Quantum memories play a crucial role in enabling large-scale quantum networks, requiring strict requirements such as storage time, retrieval efficiency, bandwidth, and scalability. On warm atomic vapor platforms, both on- and off-resonant ladder protocols show promise in combining efficient high-bandwidth operation with on-demand retrieval, though the storage time is limited by motion-induced dephasing from the broad velocity distribution of atoms. However, velocity selective optical pumping has been demonstrated here to overcome this decoherence mechanism, potentially increasing the achievable memory storage time for vapor memories.
Article
Materials Science, Multidisciplinary
Zheng Yin, Qi Sun, Liangliang Chen, Mingxu Du, Yan-Ying Huang, Qian Peng, Guanxin Zhang, Deqing Zhang
Summary: The development of organic room-temperature phosphorescence (RTP) materials is challenging. This paper reports a new purely organic RTP emitter with an ultralong lifetime and high phosphorescence quantum yield.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Stefan Krastanov, Mikkel Heuck, Jeffrey H. Shapiro, Prineha Narang, Dirk R. Englund, Kurt Jacobs
Summary: Recent progress in nonlinear optical materials and microresonators has made quantum computing with bulk optical nonlinearities possible. A reprogrammable room-temperature photonic quantum logic approach has been proposed, which simplifies the realization of various quantum circuits.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Juan Rogelio Tena-Garcia, Alejandro Casillas-Ramirez, Ricardo Guerrero-Ortiz, David Ricardo Poire de la Cruz, Karina Suarez-Alcantara
Summary: The dehydrogenation temperature of LiAlH4 can be significantly reduced by producing mixtures with ZrCl4 through ball milling at low temperatures. This method allows for efficient hydrogen release by achieving small aggregate size and preventing substantial decomposition. However, the LiAlH4/ZrCl4 mixtures are unstable and difficult to handle. The dehydrogenation pathway is changed in the mixtures, resulting in the formation of Al, LiCl, Zr, and H2 as the main products.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Geosciences, Multidisciplinary
Wei Dang, Haikuan Nie, Jinchuan Zhang, Xuan Tang, Shu Jiang, Xiaoliang Wei, Yang Liu, Fengqin Wang, Pei Li, Zhipeng Chen
Summary: A new method based on HVA-PCM is proposed for analyzing the pore-scale mechanisms and characterization of light oil storage in shale nanopores. The method utilizes experimental and mathematical analysis processes to reveal the storage structure and features of light oil at the pore scale. The results provide insights into the distribution and storage state of oil in nanopores. Additionally, the advantages and limitations of the method are discussed, along with suggestions for improvement.
GEOSCIENCE FRONTIERS
(2022)
Article
Engineering, Environmental
Xiaoxiang Li, Jingyi Zhang, Yizhe Liu, Yangzhe Xu, Kehang Cui, Zhenpeng Yao, Benwei Fu, Chengyi Song, Wen Shang, Peng Tao, Tao Deng
Summary: This study introduces alkali hydroxides into sugar alcohols to increase the activation energy barrier for liquid-to-solid phase transition and stabilize the supercooling state, enabling long-term phase change thermal energy storage. The charged composites can maintain the supercooled state and conserve latent heat for months at room temperature or extremely cold temperatures. The composites also demonstrate high solar absorptance and enable seasonable storage of solar-thermal energy as latent heat at room temperature.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Optics
Jiao Yang, Guofei An, Juhong Han, Lei Wang, Xiaoxu Liu, He Cai, You Wang
Summary: In this paper, a mathematical model was constructed to evaluate the ASE effects and temperature distribution of a vapor cell of the V-pumped thin-disk alkali laser. By reducing the number of output conditions and adopting a parallel computation algorithm, the computation speed has been greatly improved. The results show that ASE effects in a thin-disk DPAL cannot be ignored especially when the size of a pump beam becomes big, and are tightly related to pump power, thickness and temperature of a thin-disk cell, and reflectivity of the output coupler (OC).
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Hien Duy Mai, Sangmin Jeong, Tri Khoa Nguyen, Jong-Sang Youn, Seungbae Ahn, Cheol-Min Park, Ki-Joon Jeon
Summary: This study successfully developed a sensing approach using Pd/MoS2 heterostructures that can detect low-concentration hydrogen at room temperatures, with performance enhanced three-fold under visible light illumination. Photoactivation also enabled excellent sensing reversibility and reproducibility in the obtained sensor.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Xiaoyu Wu, Huayu Wu, Bin Xie, Rui Wang, Jiaming Wang, Denggui Wang, Qiaofang Shi, Guowang Diao, Ming Chen
Summary: The paper presents the rational design of dual-wall hollow nanospheres (DWHNS) Sn/MoS2@C, which exhibit abundant inner space and high specific surface area, providing more support sites and alleviating the volume effect of tin-based electrode materials. The composite material shows outstanding specific capacity and satisfactory reversibility in lithium, sodium, and potassium ion batteries.
Article
Nanoscience & Nanotechnology
Fei Song, Jian Hu, Guohao Li, Jie Wang, Shuijiao Chen, Xiuqiang Xie, Zhenjun Wu, Nan Zhang
Summary: This study reports on the low-temperature assembly of MXene nanosheets into robust three-dimensional aerogels. By using suitable cross-linking agents, graphene oxide-assisted assembly of Ti3C2Tx MXene aerogel with high Ti3C2Tx content and robustness was achieved. Further modification allowed for the use of this aerogel as a freestanding anode for sodium-ion storage, demonstrating promising electrochemical performances.
NANO-MICRO LETTERS
(2022)
Article
Chemistry, Physical
Aditya Kumar, Saurav K. Ojha, Nidhi Vyas, Animesh K. Ojha
Summary: In this study, the hydrogen storage capacity of Li-doped B clusters was investigated using density functional theory. The results showed that the clusters adsorb hydrogen molecules in a molecular form, and the addition of Li atoms enhances the adsorption. The clusters remained stable even after hydrogen adsorption at room temperature, and Li5B14 exhibited the highest hydrogen storage capacity at room temperature.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Multidisciplinary Sciences
Young-Hoon Kim, Yaxin Zhai, Haipeng Lu, Xin Pan, Chuanxiao Xiao, E. Ashley Gaulding, Steven P. Harvey, Joseph J. Berry, Zeev Valy Vardeny, Joseph M. Luther, Matthew C. Beard
Summary: Traditional optoelectronic approaches rely on both electrical and magnetic fields to control spin, charge, and light, while the use of chiral-induced spin selectivity (CISS) technology allows for the fabrication of a spin-LED that operates at room temperature without the need for magnetic fields or ferromagnetic contacts.
Article
Chemistry, Physical
Shasha Sun, Jian Liang, Ruobai Liu, Wei Shen, Haijing Wu, Mingming Tian, Lulu Cao, Yutian Yang, Zhaocong Huang, Weiwei Lin, Jun Du, Zhenhua Ni, Yongbing Xu, Qian Chen, Ya Zhai
Summary: Chromium tellurides have unique properties that make them suitable for spintronic applications. The anisotropic magnetoresistance (AMR) behavior of ferromagnetic CrTe single crystal flakes shows promising potential for spintronics applications, with the AMR ratio increasing at lower temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Multidisciplinary
Anatoli Tsinovoy, Or Katz, Arie Landau, Nimrod Moiseyev
Summary: Noble-gas spins have long coherence times but slow preparation. This study proposes a mechanism to enhance spin transfer rate and discovers resonant collisions can increase spin-exchange cross section and polarization rate coefficient.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
R. Shaham, O. Katz, O. Firstenberg
Summary: In this study, we achieved strong coherent coupling between noble-gas spins and optically accessible spins of an alkali-metal vapour through the accumulation of stochastic spin-exchange collisions. The coupling strength obtained was ten times higher than the decay rate and we were able to actively control the coupling using an external magnetic field. This approach could lead to fast and efficient interfaces for noble-gas spins, enabling applications in quantum sensing and information.
Article
Multidisciplinary Sciences
Tomas Opatrny, Simon Brauer, Abraham G. Kofman, Avijit Misra, Nilakantha Meher, Ofer Firstenberg, Eilon Poem, Gershon Kurizki
Summary: We propose heat machines that are nonlinear, coherent, and closed systems composed of few field modes. These machines can transform thermal-state input into nonthermal output with controlled quantum fluctuations, providing an output with reduced uncertainty that may be useful for sensing or communications in the quantum domain. They can be realized in optomechanical cavities or cold gases where interactions between photons or atoms are utilized.
Article
Physics, Multidisciplinary
Ran Finkelstein, Samir Bali, Ofer Firstenberg, Irina Novikova
Summary: This tutorial introduces the theoretical and experimental basics of electromagnetically induced transparency (EIT) in thermal alkali vapors. The authors provide a brief description of EIT in simple three-level systems of stationary atoms and derive analytical expressions for optical absorption and dispersion under EIT conditions. They then discuss the effects of thermal motion of atoms on various parameters of the EIT system, including Doppler broadening, atomic motion, and depopulation. Furthermore, the authors discuss common trade-offs important for optimizing an EIT experiment and provide an overview of current and potential EIT applications.
NEW JOURNAL OF PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Seffi Cohen, Or Katz, Dan Presil, Ofir Arbili, Lior Rokach
Summary: Excessive drinking is a significant risk factor for various health complications. The current diagnostic methods for alcoholism, which rely on blood tests and subjective questionnaires, have limitations. This study aims to develop new EEG classification methods to improve accuracy in predicting alcoholism. By converting temporal data into images and utilizing ensemble classification models, our algorithm achieves a cross-validation classification accuracy of 85.52%, outperforming the state-of-the-art method by 4.33%.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Multidisciplinary
Meirav Pinkas, Or Katz, Jonathan Wengrowicz, Nitzan Akerman, Roee Ozeri
Summary: The formation of weakly bound molecular states between an ultracold atom and a single trapped ion in the presence of a linear Paul trap is observed. It is found that bound states can efficiently form in binary collisions, enhancing the rate of inelastic processes. The dependence of the molecular properties on the trapping parameters enables further studies on the characterization and control of ultracold collisions.
Article
Physics, Multidisciplinary
Daiwei Zhu, Gregory D. Kahanamoku-Meyer, Laura Lewis, Crystal Noel, Or Katz, Bahaa Harraz, Qingfeng Wang, Andrew Risinger, Lei Feng, Debopriyo Biswas, Laird Egan, Alexandru Gheorghiu, Yunseong Nam, Thomas Vidick, Umesh Vazirani, Norman Y. Yao, Marko Cetina, Christopher Monroe
Summary: The ability to perform measurements in the middle of a quantum circuit is a powerful resource that underlies various applications. This study demonstrates quantum computational advantage using mid-circuit measurements, with an efficient classical verification process based on cryptographic assumptions. The methods can be scaled for larger systems and applied to a range of interactive quantum protocols.
Article
Physics, Multidisciplinary
Or Katz, Christopher Monroe
Summary: Trapped atomic ion crystals serve as a leading platform in quantum simulations of spin systems, where programmable and long-range spin-spin interactions are achieved through excitations of phonons. In this study, we propose a complementary approach using phonons in trapped-ion crystals to simulate bosonic systems, mediated by excitations of trapped-ion spins. This scheme allows for high programmability across a dense graph of bosonic couplings, utilizing long-lived collective phonon modes in a trapped-ion chain. It is well-suited for tackling challenging problems such as boson sampling and simulations of long-range bosonic and spin-boson Hamiltonians.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Itay M. Bloch, Roy Shaham, Yonit Hochberg, Eric Kuflik, Tomer Volansky, Or Katz
Summary: Ultralight axion-like particles are well-motivated relics that might compose the cosmological dark matter. Researchers report on the terrestrial bounds for the coupling of axion-like particles to neutrons and protons, providing reliable limits for the coupling of protons and neutrons with axion-like dark matter.
NATURE COMMUNICATIONS
(2023)
Article
Quantum Science & Technology
Or Katz, Marko Cetina, Christopher Monroe
Summary: Trapped atomic ion qubits or effective spins are a powerful quantum platform for quantum computation and simulation, featuring densely connected and efficiently programmable interactions between the spins. We propose and analyze a mechanism that extends the standard Molmer-Sorensen pairwise entangling gate and generates a controllable and programmable coupling between N spins of trapped ions. We demonstrate that spin-dependent optical parametric drives can generate a coordinate transformation of the collective ion motion, resulting in a nonlinear coupling between the spins. We provide a simple framework for constructing high-order spin Hamiltonians and gates, considering the effect of multiple modes of motion, and evaluate their performance under realistic conditions.
Article
Optics
Or Katz, Roy Shaham, Eran Reches, Alexey Gorshkov, Ofer Firstenberg
Summary: This article outlines and characterizes methods for mapping the state of photons onto collective states of noble-gas spins, which are long-lived but optically inaccessible. The mapping is achieved through coherent spin-exchange interaction arising from random collisions with alkali vapor.
Article
Quantum Science & Technology
Or Katz, Roy Shaham, Ofer Firstenberg
Summary: An ensemble of noble-gas nuclear spins is a unique quantum system that can maintain coherence for long periods of time at room temperature and above. By colliding with alkali-metal atoms, these spins can interface with other quantum systems while preserving their coherence. This allows for efficient, controllable, and deterministic entanglement and exchange of excitations.
