Bulletin of the American Physical Society
39th Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics
Volume 53, Number 7
Tuesday–Saturday, May 27–31, 2008; State College, Pennsylvania
Session V1: Hot Topics |
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Chair: Pierre Meystre, University of Arizona Room: Nittany Lion Inn Ballroom CDE |
Saturday, May 31, 2008 10:30AM - 11:06AM |
V1.00001: Cooling of gram scale objects Invited Speaker: Laser cooling of macroscopic mechanical oscillators has applications in high precision measurements, gravitational wave detectors, and exploration of the classical-quantum transition. We describe a series of cooling experiments, inspired by gravitational wave detectors, to trap and cool gram scale mirror oscillators. To approach quantum limits of oscillators with such a high mass requires the use of a variety of cooling techniques that employ frictionless forces, both to trap the mirror by increasing its effective mechanical resonant frequency, and to cool the mirror by damping its motion within the trap. The frictionless forces are created from either radiation pressure in a detuned optical resonator, or from electronic feedback forces in an active servo. As the experiments approach the quantum regime, an assortment of non-classical behavior and effects should become evident, such as quantum radiation pressure noise, and squeezing and entanglement of the light and mirror states. We will discuss the prospects for observation of these effects in our current apparatus, and also with expected upgrades. [Preview Abstract] |
Saturday, May 31, 2008 11:06AM - 11:42AM |
V1.00002: An Approach to Quantum Computing with Neutral Atoms in a 3D Optical Lattice Invited Speaker: The long coherence time of neutral atom ground states in optical traps make them promising qubits. In particular, three-dimensional (3D) optical lattices allow many atoms to be trapped, each with many near neighbors. They also present the possibility of both individual and parallel site addressing. As a first step toward such a quantum computer, we have trapped hundreds of single Cs atoms in a blue-detuned 3D optical lattice with 4.9 micron spacing, and reliably imaged where they are using laser cooling light. With tight trapping in all directions, these atoms can be well-cooled in all dimensions. We have also implemented state detection using state-selective imaging. We will show how to execute site-specific one and two qubit quantum gates in this geometry using microwaves and focused laser beams. [Preview Abstract] |
Saturday, May 31, 2008 11:42AM - 12:18PM |
V1.00003: Stopping supersonic beams with atomic and molecular coilguns Invited Speaker: We report a method that enables the stopping and trapping of any paramagnetic atom or molecule using a series of pulsed electromagnetic coils. Results of stopping metastable neon and molecular oxygen with a 64 stage coilgun will be presented and applications to fundamental problems in physics and chemistry discussed. [Preview Abstract] |
Saturday, May 31, 2008 12:18PM - 12:54PM |
V1.00004: Cavity QED with a Bose-Einstein condensate Invited Speaker: Cavity quantum electrodynamics (cavity QED) deals with the interaction of matter with the radiation field inside a resonator. In the regime of strong coupling a single atom--photon system coherently evolves over dynamically relevant timescales before the interaction with the environment leads to decohering processes. By strongly coupling a Bose-Einstein condensate (BEC) to the quantized field of a high-finesse optical cavity, we experimentally enter a new regime of cavity QED where all atoms couple identically and highly controlled to the cavity field. The collective nature of the internal state dynamics of this coupled BEC--cavity system is verified in the energy spectrum for a single excitation shared between BEC and cavity. In the far dispersive regime, the simultaneous coupling of all atoms to a single radiation mode gives rise to a highly nonlinear feedback mechanism between atomic motion and cavity field. We continuously monitor the coherent evolution of the driven system and find a degenerate matterwave to be requisite for the observed behavior. Besides its decisive relevance to the field of quantum information processing, the presented system offers a variety of interesting phenomena expected in the field of quantum gases within a quantum optical lattice. [Preview Abstract] |
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