39 research outputs found
Methods, systems, and apparatus for storage, transfer and/or control of information via matter wave dynamics
Methods, systems and apparatus for generating atomic traps, and for storing, controlling and transferring information between first and second spatially separated phase-coherent objects, or using a single phase-coherent object. For plural objects, both phase-coherent objects have a macroscopic occupation of a particular quantum state by identical bosons or identical BCS-paired fermions. The information may be optical information, and the phase-coherent object(s) may be Bose-Einstein condensates, superfluids, or superconductors. The information is stored in the first phase-coherent object at a first storage time and recovered from the second phase-coherent object, or the same first phase-coherent object, at a second revival time. In one example, an integrated silicon wafer-based optical buffer includes an electrolytic atom source to provide the phase-coherent object(s), a nanoscale atomic trap for the phase-coherent object(s), and semiconductor-based optical sources to cool the phase-coherent object(s) and provide coupling fields for storage and transfer of optical information
Observation of Hybrid Soliton Vortex-Ring Structures in Bose-Einstein Condensates
We present the experimental discovery of compound structures comprising
solitons and vortex rings in Bose-Einstein condensates (BECs). We examine both
their creation via soliton-vortex collisions and their subsequent development,
which is largely governed by the dynamics of interacting vortex rings. A
theoretical model in three-dimensional (3D) cylindrical symmetry is also
presented.Comment: 5 pages, 4 figures; submitted to PR
Observation of Quantum Shock Waves Created with Ultra Compressed Slow Light Pulses in a Bose-Einstein Condensate
We have used an extension of our slow light technique to provide a method for
inducing small density defects in a Bose-Einstein condensate. These
sub-resolution, micron-sized defects evolve into large amplitude sound waves.
We present an experimental observation and theoretical investigation of the
resulting breakdown of superfluidity. We observe directly the decay of the
narrow density defects into solitons, the onset of the `snake' instability, and
the subsequent nucleation of vortices.Comment: 15 pages, 5 figure
Creation of long-term coherent optical memory via controlled nonlinear interactions in Bose-Einstein condensates
A Bose-Einstein condensate confined in an optical dipole trap is used to
generate long-term coherent memory for light, and storage times of more than
one second are observed. Phase coherence of the condensate as well as
controlled manipulations of elastic and inelastic atomic scattering processes
are utilized to increase the storage fidelity by several orders of magnitude
over previous schemes. The results have important applications for creation of
long-distance quantum networks and for generation of entangled states of light
and matter.Comment: published version of the pape
Electro-Optical Nanotraps for Neutral Atoms
We propose a new class of nanoscale electro-optical traps for neutral atoms.
A prototype is the toroidal trap created by a suspended, charged carbon
nanotube decorated with a silver nanosphere dimer. An illuminating laser field,
blue detuned from an atomic resonance frequency, is strongly focused by
plasmons induced in the dimer and generates both a repulsive potential barrier
near the nanostructure surface and a large viscous damping force that
facilitates trap loading. Atoms with velocities of several meters per second
may be loaded directly into the trap via spontaneous emission of just two
photons.Comment: 5 pages, 3 figures. Fig. 1 appeared on the cover of the January 23,
2009 issue of PR
Recommended from our members
Bound States of Guided Matter Waves: An Atom and a Charged Wire
We argue that it is possible to bind a neutral atom in stable orbits around a wire charged by a time-varying sinusoidal voltage. Both classical and quantum-mechanical theories for this system are discussed, and a unified approach to the Kapitza picture of effective potentials associated with high-frequency fields is presented. It appears that cavities and waveguides for neutral-atomic-matter waves may be fashioned from these considerations.Engineering and Applied SciencesPhysicsOther Research Uni
Field Ionization of Cold Atoms near the Wall of a Single Carbon Nanotube
We observe the capture and field ionization of individual atoms near the side
wall of a single suspended nanotube. Extremely large cross sections for
ionization from an atomic beam are observed at modest voltages due to the
nanotube's small radius and extended length. The effects of the field strength
on both the atomic capture and the ionization process are clearly distinguished
in the data, as are prompt and delayed ionizations related to the locations at
which they occur. Efficient and sensitive neutral atom detectors can be based
on the nanotube capture and wall ionization processes.Comment: Article (8 pages) and Supplementary Information (4 pages). Associated
figure appeared on cover of the April 2, 2010 issue of PRL
A High Flux Source of Cold Rubidium
We report the production of a continuous, slow, and cold beam of 87-Rb atoms
with an unprecedented flux of 3.2 x 10^12 atoms/s and a temperature of a few
milliKelvin. Hot atoms are emitted from a Rb candlestick atomic beam source and
transversely cooled and collimated by a 20 cm long atomic collimator section,
augmenting overall beam flux by a factor of 50. The atomic beam is then
decelerated and longitudinally cooled by Zeeman slowing
Recommended from our members
Supersymmetry and the Binding of a Magnetic Atom to a Filamentary Current
We suggest the binding of neutral atoms to a current carrying wire through the interaction between the atomic magnetic dipole moment and the wire's magnetic field. The theoretical description is based upon an extension of the concept of supersymmetry to multicomponent wave functions. A solution for spin 1/2 particles is obtained directly in coordinate space. Spin 1 particles are considered as well. Experimentally, the system should be immediately realizable for 25 μK sodium atoms around a wire with a diameter of 0.5 μm and a current of 400 μA.Engineering and Applied SciencesPhysicsOther Research Uni