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 C7: Optomechanics and Optics of Cold Atoms |
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Chair: Tobias Kampschulte, University of Basel Room: Delaware CD |
Tuesday, June 9, 2015 2:00PM - 2:12PM |
C7.00001: Sensing of mechanical motion at the quantum level via a hybrid atom-optomechanical setup HyoJun Seok, Francesco Bariani, Swati Singh, Mukund Vengalattore, Pierre Meystre We consider a hybrid quantum system in which an optomechanical cavity is coupled to a Fabry-P\'erot cavity containing a trapped cold atomic ensemble. We show that it is possible to cool the mechanics to the ground state from room temperature outside the resolved-sideband regime by optically coupling it to the internal levels of the atoms. We also find that while in the familiar homodyne detection of small displacements this system exhibits the same standard quantum limit as traditional cavity optomechanics, it is possible to engineer the optical response of the atoms so as to realize a back-action evading measurement scheme. [Preview Abstract] |
Tuesday, June 9, 2015 2:12PM - 2:24PM |
C7.00002: Quantum mechanical oscillators coupled by a cavity-mediated optical spring Jonathan Kohler, Nicolas Spethmann, Sydney Schreppler, Lukas Buchmann, Dan Stamper-Kurn Cavity optomechanics with a single oscillator has led to many interesting results, such as generating squeezed light, quantum limited detection, and entangling optical and mechanical modes. Adding another oscillator opens new opportunities, such as two-mode back-action-evasion measurements, correlations at the quantum level, long-range interactions, and quantum information applications. I will present our recent work, realizing phase-coherent energy exchange between independent ultracold-atomic oscillators, mediated by a cavity field. The long-range coupling force is mediated by real photons in a driven-dissipative cavity, which necessarily imparts back-action noise onto the system. I will also discuss ongoing work in multi-mode mechanics and spin systems. [Preview Abstract] |
Tuesday, June 9, 2015 2:24PM - 2:36PM |
C7.00003: Resonant interaction of trapped cold atoms with a magnetic cantilever tip Cris Montoya, Jose Valencia, Andrew Geraci, Matthew Eardley, John Kitching We report the resonant coupling of laser cooled trapped Rb atoms to a micro-cantilever with a magnetic tip. An atom chip is used to trap, cool, and transport the atoms to the tip of the cantilever. The capacitively-driven cantilever oscillation produces Zeeman state transitions which result in a loss of population in the trap. In a suitably scaled setup, mechanical resonators could be used to probe and manipulate atomic spins with nanometer spatial resolution and single-spin sensitivity; this technique may enable new approaches in neutral-atom quantum computation, quantum simulation, or precision sensing. [Preview Abstract] |
Tuesday, June 9, 2015 2:36PM - 2:48PM |
C7.00004: Levitated Optomechanics for Fundamental Physics Muddassar Rashid, James Bateman, Jamie Vovrosh, David Hempston, Hendrik Ulbricht Optomechanics with levitated nano- and microparticles is believed to form a platform for testing fundamental principles of quantum physics, as well as find applications in sensing. We will report on a new scheme to trap nanoparticles, which is based on a parabolic mirror with a numerical aperture of 1. Combined with achromatic focussing, the setup is a cheap and readily straightforward solution to trapping nanoparticles for further study. Here, we report on the latest progress made in experimentation with levitated nanoparticles; these include the trapping of 100 nm nanodiamonds (with NV-centres) down to 1 mbar as well as the trapping of 50 nm Silica spheres down to $10^{?4}$ mbar without any form of feedback cooling. We will also report on the progress to implement feedback stabilisation of the centre of mass motion of the trapped particle using digital electronics. Finally, we argue that such a stabilised particle trap can be the particle source for a nanoparticle matterwave interferometer. We will present our Talbot interferometer scheme, which holds promise to test the quantum superposition principle in the new mass range of $10^{6}$ amu. [Preview Abstract] |
Tuesday, June 9, 2015 2:48PM - 3:00PM |
C7.00005: Spin-mediated Hybrid Quantum Optomechanics Airlia Shaffer, Laura Chang, Yogesh Sharad Patil, Francesco Bariani, Swati Singh, Aditya Date, Srivatsan Chakram, Keith Schwab, Pierre Meystre, Mukund Vengalattore We describe our realization of a hybrid quantum system where a macroscopic mechanical resonator is coupled to the collective spin of an ultracold gas through a remote optical interface. Through this interface, the spin ensemble is capable of sympathetic cooling, sub-SQL detection and quantum control of the mechanical resonator. As such, this hybrid quantum system presents a powerful scheme to combine the robustness of the mesoscopic resonator with the sensitivity and coherence of the spin ensemble. Our ongoing studies of this system include various aspects of quantum metrology and the out-of-equilibrium dynamics of open quantum systems. [Preview Abstract] |
Tuesday, June 9, 2015 3:00PM - 3:12PM |
C7.00006: Sensing feeble microwave signals via an optomechanical transducer Keye Zhang, Francesco Bariani, Ying Dong, Weiping Zhang, Pierre Meystre Due to their low energy content microwave signals at the single-photon level are extremely challenging to measure. Guided by recent progress in single-photon optomechanics and hybrid optomechanical systems, we propose a multimode optomechanical transducer that can detect intensities significantly below the single-photon level via off-resonant adiabatic transfer of the microwave signal to the optical frequency domain where the measurement is then performed. The influence of intrinsic quantum and thermal fluctuations on the performance of this detector are considered in detail. [Preview Abstract] |
Tuesday, June 9, 2015 3:12PM - 3:24PM |
C7.00007: Quantum theory of cavityless feedback cooling of an optically trapped nanoparticle Brandon Rodenburg, Mishkat Bhattacharya, Levi Neukirch, A. Nick Vamivakas We consider the optomechanics of subwavelength dielectric particles optically trapped in free space, as realized in recent experiments in several groups. We present a theoretical model, specifically a Markovian master equation, that treats both the mechanical and optical degrees of freedom quantum mechanically. Using this equation, we discuss optical feedback cooling of the nanoparticle, with emphasis on preparation of the mechanical ground state. [Preview Abstract] |
Tuesday, June 9, 2015 3:24PM - 3:36PM |
C7.00008: Probing Atomic Dynamics and Structures Using Optical Patterns Bonnie L. Schmittberger, Daniel J. Gauthier Pattern formation is a widely studied phenomenon that can provide fundamental insights into nonlinear systems. Emergent patterns in cold atoms are of particular interest in condensed matter physics and quantum information science because one can relate optical patterns to spatial structures in the atoms. In our experimental system, we study multimode optical patterns generated from a sample of cold, thermal atoms. We observe this nonlinear optical phenomenon at record low input powers due to the highly nonlinear nature of the spatial bunching of atoms in an optical lattice.\footnote{B. L. Schmittberger and D. J. Gauthier, Phys. Rev. A \textbf{90}, 013813 (2014)} We present a detailed study of the dynamics of these bunched atoms during optical pattern formation. We show how small changes in the atomic density distribution affect the symmetry of the generated patterns as well as the nature of the nonlinearity that describes the light-atom interaction. [Preview Abstract] |
Tuesday, June 9, 2015 3:36PM - 3:48PM |
C7.00009: Microscopic Lensing by a Dense, Cold Atomic Sample Stetson Roof, Kasie Haga, Mark Havey, Dmitriy Kupriyanov, Igor Sokolov We investigate a micron-scale lensing effect exhibited by a cold, dense sample of $^{87}$Rb atoms and draw parallels with that of a simple convex/concave lens. The experiment is carried out in the fashion of traditional z-scan measurements but in much weaker fields and where close attention is paid to the detuning dependence of the transmitted light. The results are interpreted using numerical simulations and by modeling the atom sample as a thin lens. [Preview Abstract] |
Tuesday, June 9, 2015 3:48PM - 4:00PM |
C7.00010: Traditional optics fails in cold dense gases Juha Javanainen We study propagation of light in a homogeneously broadened atomic sample essentially exactly by means of classical-electrodynamics simulations, using a slab of matter with light in normal incidence as the specific example. We find that traditional optics fails qualitatively by the time the average distance between the atoms is comparable to or smaller than the inverse of the wavenumber of the driving light. The reason is that Maxwell's equations for a polarizable medium are a mean-field theory, while light-mediated dipole-dipole interactions make a dense and cold atomic gas a strongly correlated system. We demonstrate large deviations from standard optics already at surprisingly low densities. [Preview Abstract] |
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