Bulletin of the American Physical Society
48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 62, Number 8
Monday–Friday, June 5–9, 2017; Sacramento, California
Session M6: New Techniques in cold gases |
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Chair: Mark Edwards, Georgia Southern University Room: 311-312 |
Thursday, June 8, 2017 8:00AM - 8:12AM |
M6.00001: Ultracold and ultrafast: Probing quantum gases with femtosecond laser pulses Philipp Wessels, Bernhard Ruff, Tobias Kroker, Steffen Pehm\"oller, Juliette Simonet, Markus Drescher, Klaus Sengstock Ultrafast lasers open new pathways for probing and manipulating ultracold atomic systems in order to address fundamental questions in quantum physics. The short pulses act as a highly localized instantaneous trigger to drive complex dynamics and enable access to coherence properties in macroscopic quantum targets and superfluid matter. We report on first experiments exploring ultracold $^{87}$Rb atoms and Bose-Einstein condensates (BEC) exposed to ultrashort laser pulses of 280 fs duration. The intense light pulses create ions within the focal region via strong-field ionization and the remaining atoms are detected by absorption imaging. Additionally, we quantify the momentum transferred to the atoms by the femtosecond laser pulse. Since the amount of generated ions is tunable, a tool with the potential to create hybrid quantum systems of few ions immersed in the trapped cloud is provided. First results already indicate the formation of a long-lived ultracold plasma state. Analyzing the charged fragments after ionization promises further insight so that we discuss perspectives on detecting ions and electrons in a new experimental setup to investigate coherence transfer from a macroscopic wave function to its microscopic constituents. [Preview Abstract] |
Thursday, June 8, 2017 8:12AM - 8:24AM |
M6.00002: Ultracold Molecule Assembly with Photonic Crystals Jesus Perez-Rios, May Kim, Chen-Lung Hung We present a viable experimental scheme for ultracold molecule assembly in a tailored nanophotonic environment. In particular, a photonic crystal waveguide is specially designed to trap an array of cold atoms and induce strong radiative coupling between the photoassociated, molecular excited state with the desired metaestable or ground molecular state, thereby greatly enhancing radiative decay probability into the selected ground molecular state after photoassociation. We propose to use a single-step photoassociation scheme to convert free atom pairs directly into the deeply-bound molecular ground state with near unity conversion efficiency and with high production rate. These ground state molecules will remain trapped along the nanophotonic structure, which can then serve as an efficient light-molecule interface, opening up the possibility to coherently address the internal levels of trapped molecules and perform state-sensitive, non-destructive molecule detection for future quantum applications. [Preview Abstract] |
Thursday, June 8, 2017 8:24AM - 8:36AM |
M6.00003: Neutral Atom Imaging Using a Pulsed Electromagnetic Lens Erik Anciaux, Jamie Gardner, Yi Xu, Mark Raizen We present a novel technique for neutral atom imaging relying on a pulsed electromagnetic hexapole lens. Using a prototype lens with a supersonic beam of metastable neon, we have successfully imaged complex patterns with lower distortion and higher resolution than has been shown in any previous atom imaging experiment. Simulations suggest that with improvements in aberration correction our imaging scheme will be able to achieve nanoscale resolution, allowing for surface sensitive nanoscale atom microscopy and nanofabrication. [Preview Abstract] |
Thursday, June 8, 2017 8:36AM - 8:48AM |
M6.00004: A monolithic glass bowtie cavity trap for ultracold atoms Kevin Wright, Jesse Evans, Yanping Cai, Daniel Allman We have built a monolithic, symmetric bowtie cavity that is optimized for use as an in-vacuum crossed-beam dipole trap for ultracold atoms. The all-glass bonded construction has good passive stability, and is highly compatible with experiments involving large and/or rapidly changing magnetic fields. The hydroxide bonding technique used to assemble the cavity results in bond strengths and vacuum compatibility similar to optical contacting, but with somewhat relaxed tolerances on surface quality and preparation. Furthermore, hydroxide bonding has a long curing time that allows precise optimization of optical alignment during bonding of complex assemblies. We will report on our application of this technique to optical cavity construction, our progress toward trapping and cooling lithium atoms in a ring bowtie cavity, and discuss prospects for coupling the cavity modes to the motion of atoms trapped in the beam intersection region. [Preview Abstract] |
Thursday, June 8, 2017 8:48AM - 9:00AM |
M6.00005: Cold Atom Laboratory: exploring ultracold gas mixtures aboard the International Space Station David Aveline, Ethan Elliott, Jason Williams, Robert Thompson We report on the current status of the Cold Atom Laboratory (CAL) mission to be operated aboard the International Space Station (ISS), with emphasis on results achieved in the CAL ground test bed (GTB) facility. Utilizing~ a compact atom chip trap loaded from a dual-species magneto optical trap of rubidium and potassium, CAL is a multi-user facility developed by NASA's Jet Propulsion Laboratory (JPL) to provide the first persistent quantum gas platform in the microgravity environment of space. In the unique environment of microgravity, the confining potentials necessary to the process of cooling atoms can be arbitrarily weakened, creating gases at pikoKelvin temperatures and ultra-low densities, while the complete removal of the confining potential allows for ultracold clouds that can float virtually fixed relative to the CAL apparatus. This new parameter regime enables ultracold atom research by a globe spanning group of researchers with broad applications in fundamental physics and inertial sensing. In this paper, we describe validation and development of critical technologies in the CAL GTB, including the demonstration of the first microwave evaporation and generation of dual-species quantum gas mixtures on an atom chip. [Preview Abstract] |
Thursday, June 8, 2017 9:00AM - 9:12AM |
M6.00006: High-purity, robust alkali vapor sources without vacuum feedthroughs Rudolph Kohn, Matthew Bigelow, Eric Imhof, Matthew Squires, Spencer Olson, Brian Kasch, David Hostutler The authors report the successful implementation of a method for producing rubidium vapor at sufficient purity and with sufficient quantity to load cold atom experiments. This method requires no vacuum feedthroughs and has measurable advantages in several parameters over commercial chromate dispensers, including vapor purity, required heating power, and capacity per unit volume. It is reasonably stable when exposed to air, allowing for easy handling. Currently, this method is being integrated into the authors’ systems and its use in loading a basic 3D vapor cell magneto-optical trap (MOT) has been demonstrated, in addition to loading a 2D+ MOT which has been subsequently used to load a 3D MOT. [Preview Abstract] |
Thursday, June 8, 2017 9:12AM - 9:24AM |
M6.00007: A high-power fiber-coupled semiconductor light source with low spatio-temporal coherence Robert Schittko, Anton Mazurenko, M. Eric Tai, Alexander Lukin, Matthew Rispoli, Tim Menke, Adam M. Kaufman, Markus Greiner Interference-induced distortions pose a significant challenge to a variety of experimental techniques, ranging from full-field imaging applications in biological research to the creation of optical potentials in quantum gas microscopy. Here, we present a design of a high-power, fiber-coupled semiconductor light source with low spatio-temporal coherence that bears the potential to reduce the impact of such distortions. The device is based on an array of non-lasing semiconductor emitters mounted on a single chip whose optical output is coupled into a multi-mode fiber. By populating a large number of fiber modes, the low spatial coherence of the input light is further reduced due to the differing optical path lengths amongst the modes and the short coherence length of the light. In addition to theoretical calculations showcasing the feasibility of this approach, we present experimental measurements verifying the low degree of spatial coherence achievable with such a source, including a detailed analysis of the speckle contrast at the fiber end. \newline [Preview Abstract] |
Thursday, June 8, 2017 9:24AM - 9:36AM |
M6.00008: Plenoptic Imaging of a Three Dimensional Cold Atom Cloud Gordon Lott, John Burke, Michael Marciniak A plenoptic imaging system is capable of sampling the rays of light in a volume, both spatially and angularly, providing information about the three dimensional (3D) volume being imaged. The extraction of the 3D structure of a cold atom cloud is demonstrated, using a single plenoptic camera and a single image. The reconstruction is tested against a reference image and the results discussed along with the capabilities and limitations of the imaging system. This capability is useful when the 3D distribution of the atoms is desired, such as determining the shape of an atom trap, particularly when there is limited optical access. [Preview Abstract] |
Thursday, June 8, 2017 9:36AM - 9:48AM |
M6.00009: Abstract Withdrawn
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Thursday, June 8, 2017 9:48AM - 10:00AM |
M6.00010: Dynamical manifestations of quantum chaos Eduardo Jonathan Torres Herrera, Lea Santos A main feature of a chaotic quantum system is a rigid spectrum, where the levels do not cross. Dynamical quantities, such as the von Neumann entanglement entropy, Shannon information entropy, and out-of-time correlators can differentiate the ergodic from the nonergodic phase in disordered interacting systems, but not level repulsion from level crossing in the delocalized phase of disordered and clean models. This is in contrast with the long-time evolution of the survival probability of the initial state. The onset of correlated energy levels is manifested by a drop, referred to as correlation hole, below the asymptotic value of the survival probability. The correlation hole is an unambiguous indicator of the presence of level repulsion. [Preview Abstract] |
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