5,244 research outputs found
Photon correlations in positron annihilation
The two-photon positron annihilation density matrix is found to separate into
a diagonal center of energy factor implying maximally entangled momenta, and a
relative factor describing decay. For unknown positron injection time, the
distribution of the difference in photon arrival times is a double exponential
at the para-Ps decay rate, consistent with experiment (V. D. Irby, Meas. Sci.
Technol. 15, 1799 (2004)).Comment: Accepted for publication in Phys. Rev.
Collapsible reflector Patent
Self erecting parabolic reflector design for use in spac
Quantum superchemistry in an output coupler of coherent matter waves
We investigate the quantum superchemistry or Bose-enhanced atom-molecule
conversions in a coherent output coupler of matter waves, as a simple
generalization of the two-color photo-association. The stimulated effects of
molecular output step and atomic revivals are exhibited by steering the rf
output couplings. The quantum noise-induced molecular damping occurs near a
total conversion in a levitation trap. This suggests a feasible two-trap scheme
to make a stable coherent molecular beam.Comment: 3 figures, accepted by Phys.Rev.A (submitted to prl in July,
transferred to pra in Sep. and accepted in Nov.
Space Station Ground Processing
Space Station is a multi-element, international assembly of hardware and software designed to provide a many-disciplined capability in space. The Space Station will consist of structural elements, pressurized modules, servicing facilities, platforms, transfer stages, and the functional systems necessary for ground and flight operations. Europe, Japan, and Canada are currently participating with the United States in design and developing the preliminary of the Space Station configuration
Antibunched Emission of Photon-Pairs via Quantum Zeno Blockade
We propose a new methodology, namely "quantum Zeno blockade," for managing
light scattering at a few-photon level in general nonlinear-optical media, such
as crystals, fibers, silicon microrings, and atomic vapors. Using this tool,
antibunched emission of photon pairs can be achieved, leading to potent
quantum-optics applications such as deterministic entanglement generation
without the need for heralding. In a practical implementation using an on-chip
toroidal microcavity immersed in rubidium vapor, we estimate that high-fidelity
entangled photons can be produced on-demand at MHz rates or higher,
corresponding to an improvement of times from the
state-of-the-art.Comment: to appear in Phys. Rev. Let
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Mechanisms of femtosecond laser-induced refractive index modification of poly(methyl methacrylate)
The mechanisms of refractive index change in poly(methyl methacrylate) by frequency doubled femtosecond laser pulses are investigated. It is demonstrated that positive refractive index modificaton can be caused by a combination of depolymerization and crosslinking
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