Bulletin of the American Physical Society
46th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 60, Number 7
Monday–Friday, June 8–12, 2015; Columbus, Ohio
Session H6: Atoms in Cavities |
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Chair: Kristin Beck, Massachusetts Institute of Technology Room: Delaware AB |
Wednesday, June 10, 2015 10:30AM - 10:42AM |
H6.00001: Implementation of an adjustable-length cavity/BEC system for multimode cQED Alexander Papageorge, Alicia Kollar, Benjamin Lev Investigations of many-body physics in an AMO context often employ a static optical lattice to create a periodic potential. Such systems, while capable of exploring, e.g., the Hubbard model, lack the fully emergent crystalline order found in solid state systems whose stiffness is not imposed externally, but arises dynamically. Our new multimode cavity QED experiment introduces fully emergent and compliant optical lattices to the ultracold atom toolbox and provides new avenues to explore beyond mean-field physics. Quantum liquid crystals, spin glasses, and associative memory may arise due to the oscillatory, frustrated, and tunable-range interactions mediated by the optical cavity modes. We report the demonstration of an apparatus capable of producing a $^{87}$Rb BEC localized in the center of a degenerate multimode Fabry-{Per\'{o}t} cavity [1]. One of the cavity's mirrors is affixed to a nano-positioning stage, allowing for considerable length deviations ($\pm$1~mm) from the nominal confocal separation of 1~cm. We observe dispersive light-matter interaction in a variety of cavity configurations. We will discuss progress toward future experiments. \\[4pt] [1] A. J. Kollar, A. T. Papageorge, K. Baumann, M. A. Armen, and B. L. Lev, arXiv:1411.3069 (2014). [Preview Abstract] |
Wednesday, June 10, 2015 10:42AM - 10:54AM |
H6.00002: Quantum dynamics in spatially resolved two-atom cavity QED Andreas Neuzner, Matthias Koerber, Olivier Morin, Stephan Ritter, Gerhard Rempe When two single emitters are placed in a high-finesse optical cavity, they become indistinguishable with respect to emission into the single light mode of the cavity. In this case, interference leads to collective effects in the dynamics of light-matter interaction. We realize the described setup with a pair of rubidium atoms in a deep two-dimensional optical lattice within a Fabry-Perot cavity. A spatial displacement of the atoms introduces a difference in the phase with which the atoms couple to the cavity and an external driving laser field. This appears as a new experimental degree of freedom that is not present in single-atom experiments. A high-numerical aperture objective is used to image the atoms and identify their position with single-site resolution, enabling us to deduce the phase from the images. As a function of this phase, we record the photons emitted from the cavity with high temporal resolution. Evaluation of the photon statistics reveals effects that are reminiscent of superradiant phenomena in dense atomic media in free space. Our system opens up new avenues for fundamental studies and applications in quantum information processing. [Preview Abstract] |
Wednesday, June 10, 2015 10:54AM - 11:06AM |
H6.00003: Quantum state collapse and revival under the anti-Jaynes-Cummings model Dingshun Lv, Shuoming An, Mark Um, Junhua Zhang, Jingning Zhang, M.S. Kim, Kihwan Kim We study the evolution of a coherent state of phonon mode by anti-Jaynes-Cummings (AJC) interaction in a trapped 171Yb$+$ ion system. We observe the quantum collapse and revival phenomena by measuring its Q function at the several time intervals [1]. We measure the Q-function by detecting the probability in the vacuum state through the conventional arithmetic subtraction [2]. We also measure the corresponding Wigner function, and observe the negativity, which clearly shows non-classical state emergence during the AJC dynamic evolution. On top of the standard AJC evolution, we introduce an additional phase or Jaynes-Cummings (JC) coupling and control and reverse the dynamics. This work was supported by the National Basic Research Program of China under Grants No. 2011CBA00300 (No. 2011CBA00301), the National Natural Science Foundation of China 11374178. M.S. Kim was supported by the UK EPSRC and Royal Society Wolfson Merit Award. \\[4pt] [1] Miller C A, et al., Phys. Rev. A 46, 4323 (1992).\\[0pt] [2] Mark Um, et al., submitted. [Preview Abstract] |
Wednesday, June 10, 2015 11:06AM - 11:18AM |
H6.00004: Interacting Rydberg atoms in an optical cavity to synthesize coherent collective states using dipole blockade Santosh Kumar, Jiteng Sheng, Jonathon Sedlacek, Charlie Ewel, Haoquan Fan, James Shaffer We investigate the coherent manipulation of interacting Rydberg atoms placed inside a high-finesse optical cavity for the preparation of strongly coupled light-matter systems. We consider a four-level diamond scheme with one common Rydberg level. One side of the diamond is used to collectively excite the atoms to the Rydberg level using a pair of pulses. The other side of the diamond is used to produce a collective state that is close to resonance with a field mode of a high-finesse optical cavity. The interaction between Rydberg atoms creates a blockade which is useful for synthesizing the coherent collective state. We use numerical simulation to generate non-classical states of light and also investigate different decay mechanisms affecting this system. We also analyze our system in the case of two Rydberg excitations within the blockade volume. In this case, we show that more elaborate few excitation quantum states can be prepared in the cavity to observe interesting dynamics and analyze the correlation of the two-photon emission. [Preview Abstract] |
Wednesday, June 10, 2015 11:18AM - 11:30AM |
H6.00005: Non-classical Rydberg states for metrology experiments Eva-Katharina Dietsche, Adrien Facon, Dorian Grosso, Adrien Signoles, Igor Dotsenko, Serge Haroche, Jean-Michel Raimond, Michel Brune, Sebastien Gleyzes The Stark level structure of a Rydberg atom offers a large Hilbert space in which we can implement novel complex quantum dynamics. Coupled to a well polarized radio-frequency field, the atom behaves like a large angular momentum. We have recently demonstrated that we can use Quantum Zeno dynamics to prepare the atom in a quantum superposition of coherent spin states. The atom, initially in the circular state, is driven by the radio-frequency field while a microwave field selectively addresses a given Stark sub-level. The coupling to the microwave field leads to a restricted evolution in the Hilbert space, in which the atom periodically evolves in a quantum superposition of two spins pointing in different classical directions. Those states show a Wigner function with fast oscillating interference fringes, which are very sensitive to slight changes of the atomic frequency induced by either the Stark or the Zeeman effect. We explore how such Schrodinger cat states can be used to perform metrology experiments that measure small variations of electric or magnetic fields with a sensitivity beyond the standard quantum limit. [Preview Abstract] |
Wednesday, June 10, 2015 11:30AM - 11:42AM |
H6.00006: Modification of dispersion and pulling sensitivity via four wave mixing in a ring cavity Eugeniy E. Mikhailov, Irina Novikova, Simon Rochester, Dmitri Budker We present our work towards realization of the fast-light gyroscope prototype. Such gyroscopes should have enhanced sensitivity, when compared to a regular laser gyroscopes, provided by the negative dispersion index of refraction. Here, we will discuss schematics and underlying nonlinear effects leading to negative dispersion: level structure, optically addressed transitions, and configuration of the resonant cavity. The important parameter related to the sensitivity of the gyroscope is the pulling factor (how much the lasing frequency shift with the change of the cavity length vs the equivalent resonance frequency shift in the empty cavity). If it is larger than 1, the gyroscope is more sensitive than its canonical laser gyroscope equivalent. Our preliminary data shows that the pulling factor approaches one and even seems to exceed it. Our work is important for application in geophysics, inertial navigation, and geophysics, where one needs to measure minute rotation rates. [Preview Abstract] |
Wednesday, June 10, 2015 11:42AM - 11:54AM |
H6.00007: Rayleigh scattering as a probe of higher-order mode propagation in an optical nanofiber Fredrik K. Fatemi, Jonathan E. Hoffman, Guy Beadie, Steven L. Rolston, Luis A. Orozco Optical nanofibers can have large evanescent fields that create strong interactions with atoms. To increase the complexity of the potential landscape, recent studies have explored the use of higher-order modes. However, with several propagating modes in the nanofiber, the challenge remains of controlling the field distribution on the nanofiber waist. Here, we describe imaging Rayleigh scattered light to analyze the spatial evolution of the propagating fields throughout the entire nanofiber, including the transition from core-cladding guidance to cladding-air guidance. By measuring local beat lengths between higher-order modes in situ, we identify and systematically control the modal composition. These measurements also provide a non-destructive tool for determining variations in the waist radius to below 3 nm using entirely optical means. [Preview Abstract] |
Wednesday, June 10, 2015 11:54AM - 12:06PM |
H6.00008: Cooperative many-atom response in a one-dimensional electromagnetic waveguide Janne Ruostekoski, Juha Javanainen One-dimensional nature of several nanophotonic devices provides enhanced atom-light coupling due to tight light confinement. We investigate a cold atom cloud coupled to a one-dimensional waveguide and study collective many-atom effects in such a system when light mediates strong interactions between the atoms. The atoms respond cooperatively to incident light in a one-dimensional continuum of electromagnetic modes of the waveguide as a result of recurrent scattering processes. The atom-waveguide system displays light transport phenomena distinct from those of many-atom cavity quantum electrodynamics. We specifically address the effects of atom statistics and interactions. [Preview Abstract] |
Wednesday, June 10, 2015 12:06PM - 12:18PM |
H6.00009: Dispersive Interactions for Strong Atom-Photon Coupling in a Guided Nanophotonic Fiber Geometry Xiaodong Qi, Ben Baragiola, Poul Jessen, Ivan Deutsch Nanophotonic systems offer a robust geometry to achieve a strong interaction between guided photons and trapped cold atoms in one dimension. We analyze the tensor interaction of atoms and quantized modes of the electromagnetic field in the presence of a guiding nanophotonic optical fiber, using both a dyadic Green function method and a Heisenberg-picture input-output formalism. When detuned from resonance, the tensor linear response yields phase shifts and polarization transformations conditional on the atomic spin. Such interactions can lead to strong entanglement between the collective atomic spin and the guided photonic modes, even in a regime where the Purcell factor for enhanced spontaneous emission into the guided mode is not large. We apply this to study QND measurement-induced squeezing of the pseudospin associated with the clock transition of atomic cesium, as well as squeezing of the physical atomic spin for applications in magnetometry. In both cases, we find one can achieve several dB squeezing with a few thousands atoms. [Preview Abstract] |
Wednesday, June 10, 2015 12:18PM - 12:30PM |
H6.00010: Quantum dissipative dynamics of two-level atoms in hyperbolic metamaterials Cristian Cortes, Giacomo Torlai, Zubin Jacob Hyperbolic metamaterials (HMMs) represent a class of artificial nanostructured media that have garnered a lot of attention over the past few years due their broadband singularity in the photonic density of states. This unique property has led to many research directions ranging from subwavelength light manipulation to the control of radiative decay rates of quantum emitters in HMMs. Here, we apply a second quantization approach first developed by H. Dekker (1975), to study the quantum dissipative dynamics of a two-level atom coupled to a hyperbolic medium. The Dekker quantization approach provides a framework that allows for non-Hermitian Hamiltonians whose imaginary part represents the dissipation of the quantum system. We calculate the resonance fluorescence spectrum and steady-state dynamics of a two-level atom in an HMM. Our results take into account non-idealities of the medium such as loss and finite unit-cell size and should be experimentally observable using current nanofabrication technology. [Preview Abstract] |
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