Article
Physics, Multidisciplinary
Marta Sroczynska, Anna Dawid, Michal Tomza, Zbigniew Idziaszek, Tommaso Calarco, Krzysztof Jachymski
Summary: Ultracold molecules trapped in optical tweezers have potential for quantum technologies and precision measurements. Controlling two interacting polar molecules in separate traps using an external electric field enables quantum computing schemes, with estimated operation timescales in the range of microseconds.
NEW JOURNAL OF PHYSICS
(2022)
Review
Quantum Science & Technology
Shangguo Zhu, Yun Long, Wei Gou, Mingbo Pu, Xiangang Luo
Summary: Arrays of individual atoms trapped in optical microtraps offer a versatile platform for quantum sciences and technologies. By utilizing tunnel-coupled optical microtraps, researchers can explore exotic quantum states, phases, and dynamics that are challenging to achieve in conventional optical lattices.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Multidisciplinary
Yicheng Bao, Scarlett S. Yu, Loic Anderegg, Sean Burchesky, Derick Gonzalez-Acevedo, Eunmi Chae, Wolfgang Ketterle, Kang-Kuen Ni, John M. Doyle
Summary: A fast transport method for ultracold molecules has been developed using an electronically focus-tunable lens combined with an optical lattice, achieving high transport speed and efficiency. This enables the realization of large numerical aperture optical access and long trap lifetimes required for many studies in the field of quantum information and quantum simulation.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Katja Gosar, Vesna Pirc Jevsenak, Tadej Meznarsic, Dusan Babic, Igor Poberaj, Erik Zupanic, Peter Jeglic
Summary: In this paper, we present a method using acousto-optic deflectors to trap ultracold cesium atoms in one-dimensional atomic ensembles. We study the time interval between optical tweezer pulses and its effect on the number of atoms trapped in a single trap. We also demonstrate evaporative cooling of atoms and the preparation of atomic-ensemble arrays using multiple optical tweezers.
Article
Physics, Multidisciplinary
Sean Burchesky, Loic Anderegg, Yicheng Bao, Scarlett S. Yu, Eunmi Chae, Wolfgang Ketterle, Kang-Kuen Ni, John M. Doyle
Summary: Coherence times of rotational state qubits of laser-cooled CaF molecules in optical tweezer traps are reported, demonstrating potential as high fidelity qubits. Improvement in coherence time is suggested through further cooling and suppression of inhomogeneous broadening by tuning tweezer polarization and applied magnetic field to a magic angle. A single spin-echo pulse can extend coherence time to nearly half a second.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Adrien Devolder, Michele Desouter-Lecomte, Osman Atabek, Eliane Luc-Koenig, Olivier Dulieu
Summary: This study examines the formation of ultracold RbSr molecules with laser pulses, discussing the advantages of using the Mott insulator phase for pulse control. Two classes of strategies are presented, one involving two electronic states and the other involving only the electronic ground state with IR and THz pulses. The efficiency and robustness of these strategies are discussed in relation to experimental feasibility and current laser technologies.
Article
Optics
Yan Zhou, Minghui Hong
Summary: This work introduces a novel approach to generate sub-wavelength size 3D optical trapping through an engineered microsphere, containing diffractive patterns and fabricated by focused ion beam. The emitted light field forms a pair of axially arranged focused beams connected by a continuous optical field, creating an optical bottle beam with a 3D optical null at the center. Experimental results and numerical simulations are in good agreement, demonstrating precise and localized optical trapping capabilities.
PHOTONICS RESEARCH
(2021)
Article
Optics
Krzysztof Jachymski, Marcin Gronowski, Michal Tomza
Summary: We study the properties of intermediate four-atom complexes formed in bimolecular collisions, which play a critical role in understanding losses in experiments with ultracold alkali-metal molecules. The variation in nuclear spin-spin and quadrupole couplings can couple different rotational manifolds, increasing the density of states and lifetimes of the collision complexes. By using quantum-chemical methods, we estimate the coupling constants for bialkali four-atom complexes and model the reaction kinetics. We also find that the interaction-induced variation of electron spin-nuclear spin couplings can explain the long lifetime of alkali-metal three-atom complexes formed in atom-molecule collisions.
Article
Multidisciplinary Sciences
Loic Anderegg, Sean Burchesky, Yicheng Bao, Scarlett S. Yu, Tijs Karman, Eunmi Chae, Kang-Kuen Ni, Wolfgang Ketterle, John M. Doyle
Summary: This study demonstrates the use of microwave radiation to engineer and control interaction potentials between ultracold calcium monofluoride molecules, resulting in an effective repulsive shield that suppresses inelastic loss rate by a factor of six. The findings provide a general route for creating long-lived, dense samples of ultracold polar molecules and implementing evaporative cooling techniques.
News Item
Optics
Xiaohe Zhang, Bing Gu, Cheng-Wei Qiu
Summary: Researchers have proposed a new method that can measure the weak force of a single microscopic particle.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Quantum Science & Technology
Jessie T. Zhang, Lewis R. B. Picard, William B. Cairncross, Kenneth Wang, Yichao Yu, Fang Fang, Kang-Kuen Ni
Summary: Researchers have extended the molecular assembly technique to an array of five molecules, enabling control and manipulation of multiple molecules and unlocking the ability to study molecular interactions. They have outlined the technical challenges and solutions inherent in scaling up this system, providing a platform to utilize the vast resources and long-range dipolar interactions of molecules.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Ian Stevenson, Aden Z. Lam, Niccolo Bigagli, Claire Warner, Weijun Yuan, Siwei Zhang, Sebastian Will
Summary: We successfully create bosonic NaCs molecules in their absolute rovibrational ground state using stimulated Raman adiabatic passage. We generate ultracold gases with up to 22,000 dipolar NaCs molecules at a temperature of 300(50) nK and a peak density of 1.0(4) x 1012 cm-3. By preparing the molecules in specific quantum states, including electronic, vibrational, rotational, and hyperfine states, we achieve comprehensive quantum state control. We also measure various properties, such as the ground state ac polarizability and the two-body loss rate, and demonstrate strong microwave coupling between rotational states.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Qiang Zheng, Mingzeng Peng, Zhuo Liu, Shuyu Li, Rongcheng Han, Han Ouyang, Yubo Fan, Caofeng Pan, Weiguo Hu, Junyi Zhai, Zhou Li, Zhong Lin Wang
Summary: This study developed a force mapping method based on a light nano-antenna array with the use of piezo-phototronic effect, achieving high-resolution dynamic mapping of cell-generated force. The methodology can be applied for fundamental study of cardiomyocyte behavior and provide valuable information for heart-related research.
Article
Multidisciplinary Sciences
Lysander Christakis, Jason S. Rosenberg, Ravin Raj, Sungjae Chi, Alan Morningstar, David A. Huse, Zoe Z. Yan, Waseem S. Bakr
Summary: Synthetic quantum systems with interacting constituents are important for quantum information processing and explaining fundamental phenomena. Ultracold polar molecules offer a promising platform due to their long coherence times and long-range, anisotropic interactions. Using quantum gas microscopy, we study the dynamic correlations of polar molecules in a two-dimensional optical lattice, exploring different interaction scenarios and pushing the frontier of probing and controlling interacting systems of ultracold molecules.
Article
Physics, Multidisciplinary
R. Brooks, S. Spence, A. Guttridge, A. Alampounti, A. Rakonjac, L. A. McArd, Jeremy M. Hutson, Simon L. Cornish
Summary: In this study, exactly one Rb-87 atom and one Cs-133 atom were prepared in the same optical tweezer, serving as the essential first step towards constructing a tweezer array of (RbCs)-Rb-87-Cs-133 molecules. By carefully selecting the tweezer wavelengths, species-selective trapping potentials suitable for high-fidelity preparation of Rb + Cs atom pairs were engineered. The merging of two tweezers was achieved using an acousto-optic deflector and a piezo-controlled mirror, retaining the atom pair with a high probability of 0.99((-0.02))((+0.01)).
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
S. Spence, R. Brooks, D. K. Ruttley, A. Guttridge, Simon L. Cornish
Summary: The authors report simultaneous Raman sideband cooling of a single Rb-87 atom and a single Cs-133 atom held in separate optical tweezers. They demonstrate cooling of single Rb atoms in an array of four tweezers and prepare the atoms in the relative motional ground state with high efficiency. This work is a crucial step towards the formation of single RbCs molecules confined in optical tweezer arrays.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
R. Brooks, A. Guttridge, Matthew D. Frye, Daniel K. Ruttley, S. Spence, Jeremy M. Hutson, Simon L. Cornish
Summary: Researchers used an optical tweezer to prepare pairs of Cs-133 atoms and investigated the collisions of these atoms in specific states through Feshbach spectroscopy. They found that pair loss could be enhanced by repeatedly subdividing the optical tweezers. Resonant features of atoms in specific states were identified through inelastic loss spectroscopy. By measuring the number of atoms remaining after collisions, they revealed how different loss processes were influenced by the depth of the tweezer. These results demonstrate that optical tweezers are a versatile tool for studying two-body collisions with number-resolved detection sensitivity.
NEW JOURNAL OF PHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Jacob A. Blackmore, Philip D. Gregory, Jeremy M. Hutson, Simon L. Cornish
Summary: This article presents a computer program for calculating the quantized rotational and hyperfine energy levels of (1)sigma diatomic molecules in the presence of various fields. It is applicable to state-of-the-art experiments with ultracold molecular gases.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Instruments & Instrumentation
Adarsh P. Raghuram, Jonathan M. Mortlock, Sarah L. Bromley, Simon L. Cornish
Summary: We propose a simple motorized rotation mount for changing the polarization of light rapidly. This device is employed to switch a high power laser beam between different optical dipole traps in ultracold atom experiments. The mount utilizes a stepper motor with a hollow shaft, allowing the beam to propagate along its axis to minimize inertia and mechanical complexity. The device is characterized by its ability to switch a beam between the output ports of a polarizing beam splitter cube, demonstrating a switching time of 15.9(3) ms, a reaction time of 0.52(3) ms, and a rotational resolution of 0.45(4) degrees. The stepper motor shows high reproducibility, with no missed steps in 2000 repeated tests over 11 hours.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Multidisciplinary
Alexander Guttridge, Daniel K. Ruttley, Archie C. Baldock, Rosario Gonzalez-Ferez, H. R. Sadeghpour, C. S. Adams, Simon L. Cornish
Summary: We demonstrate Rydberg blockade between a single Rb atom and a single RbCs molecule confined in optical tweezers due to charge-dipole interaction. The molecule is efficiently transferred to the rovibrational ground state and the separation between the atom and molecule is controlled using species-specific tweezers. Excitation dynamics are observed to be consistent with simulated interaction potentials, opening up possibilities for transferring quantum information between individually trapped molecules using Rydberg atoms.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Matthew D. Frye, Jeremy M. Hutson
Summary: In this study, we examine the long-range states of complexes formed by alkali-metal diatomic molecules in a singlet state and alkali-metal atoms. We investigate the structure of the Hamiltonian for such systems and the interactions between the six angular momenta. We analyze the patterns and densities of the long-range states, as well as the Hamiltonian terms that can result in Feshbach resonances when the states cross threshold at varying magnetic fields. Using 40K 87Rb + 87Rb as a case study, we demonstrate multiple resonance types due to long-range states with rotational and/or hyperfine excitation, and discuss their likelihood at low to moderate magnetic fields.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Jiri Etrych, Gevorg Martirosyan, Alec Cao, Jake A. P. Glidden, Lena H. Dogra, Jeremy M. Hutson, Zoran Hadzibabic, Christoph Eigen
Summary: By combining bound-state spectroscopy and loss spectroscopy, we identified eight intrastate and six interstate Feshbach resonances in 39K. We characterized four intrastate and two interstate resonances, and our coupled-channel scattering calculations matched well with the experimental results. This study provides a precise map of the scattering length and allows for precise measurements of Efimov physics phenomena.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Bijit Mukherjee, Matthew D. Frye, Jeremy M. Hutson
Summary: We investigate the mechanisms of magnetically tunable Feshbach resonances in ultracold collisions between atoms in 2S and 3P0 states, and identify the relevant terms in the collision Hamiltonian. These resonances involve indirect coupling between the open and closed channels, via intermediate channels involving atoms in 3P1 states. The resonance widths are generally proportional to the square of the magnetic field and are strongly enhanced when the background scattering length is large. By choosing different isotopes of the 3P0 atom, the scattering length can be discretely tuned. Promising combinations for large background scattering length and resonances at experimentally accessible field are 87Rb + Yb, Cs + Yb, and 85Rb + Sr.
PHYSICAL REVIEW RESEARCH
(2023)
