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 G6: Hybrid Systems |
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Chair: Kenton Brown, Georgia Tech Research Institute Room: 311-312 |
Wednesday, June 7, 2017 8:00AM - 8:12AM |
G6.00001: Cavity-mediated effects in transport Claudiu Genes Transport properties of materials (transport of charge, energy, correlations, etc) can be considerably altered in the presence of strong light-matter interactions manifested in the strong coupling regime of cavity quantum electrodynamics. Recent experiments show that enhanced charge transport in organic semiconductor materials can occur [3] that can be simulated via a two-band model where the inter-band transitions are coupled to the confined light modes of a micro-cavity and consequent delocalized hybrid light-matter states participate in the transport. In a simplified quantum optical model, where a single cavity light mode is equally coupled to a chain of two-level systems, we study the modification of the typical nearest neighbor hopping transport below and inside the strong coupling regime. We find in [1] (in agreement with [3]) that the polariton-enhanced transport can show polynomial instead of exponential suppression with the system size in the presence of disorder. [1] J. Schachenmayer, C. Genes, E. Tignone and G. Pupillo, Phys. Rev. Lett., 114, 196403 (2015). [2] J. Feist and F. J. Garcia-Vidal, Phys. Rev. Lett., 114, 196402 (2015). [3] E. Orgiu et al, Nat. Mat. 14, 1123, (2015). [Preview Abstract] |
Wednesday, June 7, 2017 8:12AM - 8:24AM |
G6.00002: Atom-atom interactions in an 'Alligator' photonic crystal waveguide Ana Asenjo-Garcia, Jonathan D. Hood, Akihisa Goban, Mingwu Lu, Su-Peng Yu, Darrick E. Chang, H. Jeff Kimble New opportunities for optical physics emerge from the integration of cold atoms with nanophotonic devices. Due to their small optical loss and tight field confinement, these nanoscale dielectric devices are capable of mediating strong atom-light interactions and open new avenues for quantum transport and quantum many-body phenomena. In particular, coupling atoms to the band edge of a photonic crystal waveguide (PCW) provides a unique platform for generating tunable range coherent atom-atom interactions which are mediated by the guided mode photons. Due to the evanescent nature of the field in the band gap, dissipation into the structure is suppressed exponentially. We have experimentally observed the transition into the bandgap for the first time by shifting the band edge frequency of the PCW relative to the D1 line of atomic cesium with an average of 3 atoms trapped along the PCW [1]. In addition, we have developed a formalism that provides a clear mapping between the transmission spectra and the local Green’s function, which allows us to identify signatures of dispersive and dissipative interactions between the atoms [2]. [1] J. D. Hood et al., PNAS 113, 10507–10512 (2016). [2] A. Asenjo-Garcia, J. D. Hood, D. E. Chang, H. J. Kimble, arXiv:1606.04977 (2016). [Preview Abstract] |
Wednesday, June 7, 2017 8:24AM - 8:36AM |
G6.00003: Microwave-to-optical frequency conversion with a Rydberg atom coupled to a coplanar waveguide Bryan Gard, Kurt Jacobs, Robert McDermott, Mark Saffman A primary candidate for converting quantum information from microwave to optical frequencies is the use of Rydberg states of a single atom trapped near a surface. The fact that the Rydberg states possess both large electric dipole moments and microwave transition frequencies allows them to interact with superconducting mesoscopic circuits. By considering a concrete example, that of a Cesium atom, and using numerical search methods to optimize the control protocols, we determine the fidelities and transmission rates that could be achievable with such a device. We show that while protocols that exploit the adiabatic STIRAP mechanism provide the best raw transfer fidelities, the fastest communication speeds can be obtained by using heralding, which allows one to remove the adiabatic constraint. [Preview Abstract] |
Wednesday, June 7, 2017 8:36AM - 8:48AM |
G6.00004: A Rydberg Atom Ensemble-Surface Phonon Polariton Quantum Hybrid System Yuanxi Chao, Jiteng Sheng, Nicholas P. Bigelow, James P. Shaffer We investigate a quantum hybrid system in the strong coupling regime, formed by a Rydberg atom ensemble and a surface phonon polariton (SPhP) propagating on a periodically poled piezoelectric metamaterial surface. We present our theoretical results and initial experiments on the possibilities for achieving strong coupling. Due to the large Rydberg transition dipole moments and the local field enhancement of confined SPhP excitations, the strong coupling regime can be achieved with a dilute atomic ensemble and a proper superlattice design according to our calculations. With submicron periodically poled crystals, even when the atomic ensemble is mms away from the crystal surface, the collective atom-surface coupling can exceed the loss rates, leading to the observation of strong coupling phenomena. For our work, the Rydberg transition from 87S$_{\mathrm{1/2}}$ to 87P$_{\mathrm{1/2}}$ in rubidium is chosen to couple to a SPhP mode at $\sim $5 GHz, corresponding to a periodically poled Lithium Niobate (PPLN) surface with a period of $\sim $1 $\mu m$. To fabricate the PPLN we use the direct e-beam write poling method. [Preview Abstract] |
Wednesday, June 7, 2017 8:48AM - 9:00AM |
G6.00005: Photonic band gap induced in an atomic ensemble confined inside a hollow-core optical fiber Tae Hyun Yoon, Fereshteh Rajabi, Jeremy Flannery, Sreesh Venuturumilli, Michal Bajcsy We implement a dynamically controlled photonic bandgap \footnote{A. Andre et al., Phys. Rev. Lett. 89, 143602 (2002)} in an ensemble of laser cooled cesium atoms confined inside a hollow-core photonic crystal fiber (HCPCF). This photonic bandgap is induced in the ensemble by combining electromagnetically induced transparency (EIT) conditions with an off-resonant standing light wave, which in turn produces a rapid spatial modulation of the index of refraction experienced by the probe light. We investigate the formation of stationary light pulses through dynamic control of this bandgap. [Preview Abstract] |
Wednesday, June 7, 2017 9:00AM - 9:12AM |
G6.00006: Strongly Interacting mm-Wave and Optical Photons with Rydberg Atoms Aziza Suleymanzade, Mark Stone, Scott Eustice, Jonathan Simon, David Schuster We describe progress towards a hybrid experimental system for engineering strong interactions between single optical and mm-wave photons using Rydberg atoms as an interface. Entanglement between photons with gigahertz and optical frequencies creates a new platform to access exotic photonic quantum states as well as powerful new techniques in quantum computing and simulation. We will present recent experimental developments including trapping and cooling atoms in a cryogenic MOT, measuring high-Q superconducting cavities at 100 GHz and coupling atoms to an optical cavity inside a cryostat at 3 Kelvin. [Preview Abstract] |
Wednesday, June 7, 2017 9:12AM - 9:24AM |
G6.00007: Non-destructive photon detection using a single rare earth ion coupled to a photonic cavity Chris O'Brien, Tian Zhong, Andrei Faraon, Christoph Simon We study the possibility of using single rare-earth ions coupled to a photonic cavity with high cooperativity for performing non-destructive measurements of photons, which would be useful for global quantum networks and photonic quantum computing. We calculate the achievable fidelity as a function of the parameters of the rare-earth ion and photonic cavity, which include the ion's optical and spin dephasing rates, the cavity linewidth, the single photon coupling to the cavity, and the detection efficiency. We suggest a promising experimental realization using current state of the art technology in Nd:YVO$_4$. [Preview Abstract] |
Wednesday, June 7, 2017 9:24AM - 9:36AM |
G6.00008: The giant acoustic atom -- a single quantum system with a deterministic time delay Lingzhen Guo, Arne Grimsmo, Anton Frisk Kockum, Mikhail Pletyukhov, G\"oran Johansson We investigate the quantum dynamics of a single transmon qubit coupled to surface acoustic waves (SAWs) via two distant connection points. Since the acoustic speed is five orders of magnitude slower than the speed of light, the travelling time between the two connection points needs to be taken into account. Therefore, we treat the transmon qubit as a giant atom with a deterministic time delay. We find that the spontaneous emission of the system, formed by the giant atom and the SAWs between its connection points, initially follows a polynomial decay law instead of an exponential one, as would be the case for a small atom. We obtain exact analytical results for the scattering properties of the giant atom up to two-phonon processes by using a diagrammatic approach. The time delay gives rise to novel features in the reflection, transmission, power spectra, and second-order correlation functions of the system. Furthermore, we find the short-time dynamics of the giant atom for arbitrary drive strength by a numerically exact method for open quantum systems with a finite-time-delay feedback loop. [Preview Abstract] |
Wednesday, June 7, 2017 9:36AM - 9:48AM |
G6.00009: Controlling Neutral Atoms Near a Photonic Crystal Waveguide Transported via Optical Lattices Alex Burgers, Juan Muniz, Lucas Peng, Andrew McClung, H. Jeff Kimble Integrating ultracold atoms with nanophotonics enables the exploration of new paradigms in quantum optics and many body physics. Advanced fabrication capabilities for low-loss dielectric materials provide powerful tools to engineer light-matter coupling of photons and atoms. For example, dispersion-engineered photonic crystal waveguides (PCWs) permit not only stable trapping and probing of atoms via interactions with guided mode (GM) light, but also the possibility to study the physics of strong, photon-mediated interactions between atoms, as well atom mediated photon-photon interactions. Our current system at Caltech consists of a quasi-one-dimensional PCW whose band structure arises from periodic modulation of the dielectric structure. Here, we report a moving optical lattice utilized for transport of trapped atoms into and through the PCW in a phase-sensitive fashion. Single atoms can then be transferred from the moving lattice into optical traps formed in unit cells of the PCW by GMs of the waveguide. We present data for the optical spectra of the GM transmission and reflection that allow inference of coherent atom transport. Progress towards trapping atoms along the PCW will also be discussed. [Preview Abstract] |
Wednesday, June 7, 2017 9:48AM - 10:00AM |
G6.00010: Reduced-Density-Matrix Description of Decoherence and Relaxation Processes for Electron-Spin Systems Verne Jacobs Electron-spin systems are investigated using a reduced-density-matrix description. Applications of interest include trapped atomic systems in optical lattices, semiconductor quantum dots, and vacancy defect centers in solids. Complimentary time-domain (equation-of-motion) and frequency-domain (resolvent-operator) formulations are self-consistently developed. The general non-perturbative and non-Markovian formulations provide a fundamental framework for systematic evaluations of corrections to the standard Born (lowest-order-perturbation) and Markov (short-memory-time) approximations. Particular attention is given to decoherence and relaxation processes, as well as spectral-line broadening phenomena, that are induced by interactions with photons, phonons, nuclear spins, and external electric and magnetic fields. These processes are treated either as coherent interactions or as environmental interactions. The environmental interactions are incorporated by means of the general expressions derived for the time-domain and frequency-domain Liouville-space self-energy operators, for which the tetradic-matrix elements are explicitly evaluated in the diagonal-resolvent, lowest-order, and Markov (short-memory time) approximations. [Preview Abstract] |
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