Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session K19: Interfacing Solid State/nano Physics with Atomic SystemsInvited
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Sponsoring Units: DAMOP Chair: Yong Chen, Purdue University Room: 278-279 |
Wednesday, March 15, 2017 8:00AM - 8:36AM |
K19.00001: Interfacing cold atoms with nanophotonics for many-body physics Invited Speaker: Chen-Lung Hung Interfacing light with cold atoms localized near nanophotonic cavities and waveguides presents new opportunities for realizing scalable quantum networks and novel quantum phases of light and matter. Preliminary experimental successes include trapped atoms along nanofibers, photonic crystal cavities and waveguides. Owing to their small optical loss and tight optical field confinement, nanoscale dielectrics offer unprecedentedly strong coupling strength between single atoms and single photons. By tailoring the photonic density of states in nanophotonic structures and exploiting cold atom control toolbox, one can harness photon-mediated, coherent, as well as dissipative, long-range atom-atom interactions in a highly engineered setting. In this talk, I will discuss recent experimental progress toward achieving strong atom-atom interactions in a nanophotonic lattice for light, and prospects for inducing novel long-range quantum dynamics for many-body and topological physics. [Preview Abstract] |
Wednesday, March 15, 2017 8:36AM - 9:12AM |
K19.00002: Atomic physics meets nanophotonics: creating complex quantum states of matter and light Invited Speaker: Darrick Chang Significant efforts have been made to interface cold atoms with micro- and nano-photonic systems in recent years. Originally, it was envisioned that the migration to these systems from free-space atomic ensemble or macroscopic cavity QED experiments could dramatically improve figures of merit and facilitate scalability for applications such as quantum information processing. However, a more interesting scenario would be if nanophotonic systems could yield new paradigms for controlling quantum light-matter interactions, which have no obvious counterpart in macroscopic settings. Here, we describe one paradigm for novel physics, based upon the coupling of atoms to photonic crystal structures. In particular, we show that atoms can become dressed by localized photonic "clouds" of tunable size. This cloud behaves much like an external cavity, but which is attached to the position of the atom. This dynamically induced cavity can then mediate long-range spin interactions or forces between atoms, yielding an exotic quantum material where spins, phonons, and photons are strongly coupled. [Preview Abstract] |
Wednesday, March 15, 2017 9:12AM - 9:48AM |
K19.00003: Hybrid Quantum Information Processing with Superconductors and Neutral Atoms Invited Speaker: Robert McDermott Hybrid approaches to quantum information processing (QIP) aim to capitalize on the strengths of disparate quantum technologies to realize a system whose capabilities exceed those of any single experimental platform. At the University of Wisconsin, we are working toward integration of a fast superconducting quantum processor with a stable, long-lived quantum memory based on trapped neutral atoms. Here we describe the development of a quantum interface between superconducting thin-film cavity circuits and trapped Rydberg atoms, the key technological obstacle to realization of superconductor-atom hybrid QIP. Specific accomplishments to date include development of a theoretical protocol for high-fidelity state transfer between the atom and the cavity; fabrication and characterization of high-$Q$ superconducting cavities with integrated trapping electrodes to enhance zero-point microwave fields at a location remote from the chip surface; and trapping and Rydberg excitation of single atoms within 1 mm of the cavity. We discuss the status of experiments to probe the strong coherent coupling of single Rydberg atoms and the superconducting cavity. [Preview Abstract] |
Wednesday, March 15, 2017 9:48AM - 10:24AM |
K19.00004: A Scanning Quantum Cryogenic Atom Microscope Invited Speaker: Benjamin Lev Microscopic imaging of local magnetic fields provides a window into the organizing principles of complex and technologically relevant condensed matter materials. However, a wide variety of intriguing strongly correlated and topologically nontrivial materials exhibit poorly understood phenomena outside the detection capability of state-of-the-art high-sensitivity, high-resolution scanning probe magnetometers. We introduce a quantum-noise-limited scanning probe magnetometer that can operate from room-to-cryogenic temperatures with unprecedented DC-field sensitivity and micron-scale resolution. The Scanning Quantum Cryogenic Atom Microscope (SQCRAMscope) employs a magnetically levitated atomic Bose-Einstein condensate (BEC), thereby providing immunity to conductive and blackbody radiative heating. The SQCRAMscope has a field sensitivity of 1.4 nT per resolution-limited point (2 um), or $6 nT/Hz^1/2$ per point at its duty cycle. Compared to point-by-point sensors, the long length of the BEC provides a naturally parallel measurement, allowing one to measure nearly one-hundred points with an effective field sensitivity of 600 $pT/Hz^1/2$ each point during the same time as a point-by-point scanner would measure these points sequentially. Moreover, it has a noise floor of 300 pT and provides nearly two orders of magnitude improvement in magnetic flux sensitivity (down to $10^-6 Phi_0/Hz^1/2)$ over previous atomic probe magnetometers capable of scanning near samples. These capabilities are for the first time carefully benchmarked by imaging magnetic fields arising from microfabricated wire patterns and done so using samples that may be scanned, cryogenically cooled, and easily exchanged. We anticipate the SQCRAMscope will provide charge transport images at temperatures from room--to —4K in unconventional superconductors and topologically nontrivial materials. [Preview Abstract] |
Wednesday, March 15, 2017 10:24AM - 11:00AM |
K19.00005: From weak to ultra-strong matter-light coupling with organic materials Invited Speaker: Jonathan Keeling The idea of studying strong matter-light coupling using organic molecules has a long history, but has recently seen an explosion of experimental interest. Polaritons --- hybrid matter-light particles, formed from the superposition of cavity photons and electronic excitations in the organic materials --- have been seen in a variety of such materials, including anthracene, organic polymers, fluorenes, and various molecular aggregates. As compared to inorganic semiconductors, one intriguing novel aspect of these materials is the complex absorption and emission spectra they show, arising from the strong coupling between electronic and vibrational states. Experiments on these materials have shown polariton lasing and condensation when the material is optically pumped. Other experiments have explored how strong matter-light coupling can modify material properties, potentially even in the absence of pumping. These experiments pose several questions about the relation of polariton condensation and lasing, and about the role of vibrational modes in the physics of photon and polariton condensation. In particular, it requires understanding the interplay of two kinds of strong coupling: firstly, the coupling between cavity light and the electronic state of the molecules, and secondly the coupling between electronic state and vibrational modes of the molecules. A particular challenge arises because such systems involve many molecules, and so one is forced to address this as a many body problem. I will review how this system can be modeled, and how the behavior of the system varies from weak matter-light coupling (where one may think of a picture of incoherent absorption and emission) to strong coupling (where the new polaritonic modes arise), and ultra-strong coupling where even the vacuum state is modified by matter-light coupling. [Preview Abstract] |
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