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  • Journal article
    BUZEK V, KEITEL CH, KNIGHT PL, 1995,

    Sampling entropies and operational phase-space measurement. I. General formalism

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 51, Pages: 2575-2593, ISSN: 1050-2947

    We present an entropic description of quantum-mechanical states based on an operational approach to a phase-space measurement. We give a simple phase-space interpretation of sampling entropies in terms of which we derive very general entropic uncertainty relations reflecting the degree of the phase-space uncertainty of the quantum-mechanical state in the given measurement (i.e., for a given ‘‘quantum-ruler’’ state). We relate the sampling entropy to the von Neumann and Shannon entropy and show that the Wehrl entropy represents a particular example of a sampling entropy when the quantum ruler is represented by coherent states.
  • Journal article
    BUZEK V, KEITEL CH, KNIGHT PL, 1995,

    Sampling entropies and operational phase-space measurement. II. Detection of quantum coherences

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 51, Pages: 2594-2601, ISSN: 1050-2947

    We use the operational phase-space distributions and sampling entropies developed in the preceding paper [V. Bužek, C. H. Keitel, and P. L. Knight, Phys. Rev. A 51, 2575 (1995)] to discuss the nature of quantum interference between components of superpositions of states. We show how the Wehrl entropy, a special case of the sampling entropy, is a useful discriminator between different kinds of superpositions and of statistical mixtures, and is determined essentially by the coherent-state content. Apart from interference terms, this content is given by the quantum uncertainty of a single coherent state and the classical contribution to the number of coherent states necessary to tile the dominant phase-space ‘‘patch’’ representing the quantum state of interest. We illustrate these ideas using nonclassical superpositions of coherent states, where interference modifies the phase-space distributions, and show how these features are sensitive to dissipation.
  • Journal article
    Hinds EA, Sauer BE, Wang J, 1995,

    Anomalous Spin-Rotation Coupling in the X^2Σ+ State of YbF

    , Physical Review Letters, ISSN: 0031-9007
  • Journal article
    KEITEL CH, KNIGHT PL, 1995,

    Monte Carlo classical simulations of ionization and harmonic generation in the relativistic domain

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 51, Pages: 1420-1430, ISSN: 1050-2947

    The magnetic-field component of a very intense laser field interacting with an atom cannot normally be neglected for intensities that lead to relativistic velocities of the electrons. Here we investigate stabilization and harmonic generation in this relativistic regime from a three-dimensional hydrogen atom modeled as a classical system with a distribution of initial conditions derived from a Monte Carlo average. Particular emphasis is placed on the problems of ionization in the direction of propagation of the applied laser field, which will be shown to arise from the inclusion of the magnetic-field component of the laser field. In the harmonic spectra, Doppler shifting occurs for observation directions orthogonal to the direction of laser-field propagation. Retardation effects show up in the harmonic spectra in the forward direction and inhibit the magnetic-field effects of the free-electron contribution of the forward-direction spectrum. In general, few harmonics are observed in our single-atom treatment because of the magnetically induced three-dimensional motion of the electron for intensities approaching the relativistic regime, and because of high ionization probabilities, i.e., also the breakdown of stabilization, for strongly relativistic laser intensities.
  • Journal article
    MIYAKE Y, MARANGOS JP, SHIMOMURA K, BIRRER P, KUGA T, NAGAMINE Ket al., 1995,

    LASER SYSTEM FOR THE RESONANT IONIZATION OF HYDROGEN-LIKE ATOMS PRODUCED BY NUCLEAR-REACTIONS

    , NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, Vol: 95, Pages: 265-275, ISSN: 0168-583X
  • Journal article
    Kim MS, 1995,

    Photon statistics in two-photon linear amplifiers

    , Optics Communications, Vol: 114, Pages: 262-268, ISSN: 0030-4018
  • Conference paper
    HERBST JD, RECH B, THELEN RF, THOMPSON RCet al., 1995,

    STATUS OF THE 9-MJ RANGE GUN SYSTEM

    , 7th Symposium on Electromagnetic Launch Technology, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 540-545, ISSN: 0018-9464
  • Conference paper
    Garraway BM, Knight PL, 1995,

    Stochastic simulations of dissipation in quantum optics: Quantum superpositions

    , New York, international workshop on quantum communications and measurement JUL 10-16, 1994 NOTTINGHAM, ENGLAND, Publisher: Plenum Press Div Plenum Publishing Corp, Pages: 463-477
  • Conference paper
    MIYAKE Y, MARANGOS JP, SHIMOMURA K, BIRRER P, NAGAMINE Ket al., 1995,

    Laser resonant ionization of thermal hydrogen-like atoms produced by nuclear reactions

    , 7th International Symposium on Resonance Ionization Spectroscopy and Its Applications (RIS-94), Publisher: AIP PRESS, Pages: 215-218, ISSN: 0094-243X
  • Journal article
    Rink J, Dholakia K, Horvath GZK, Hernandez-Pozos JL, Power W, Segal DM, Thompson RC, Walker Tet al., 1995,

    A study of trapped ion dynamics by photon-correlation and pulse-probe techniques

    , Non-Neutral Plasma Physics Ii, Pages: 162-170, ISSN: 0094-243X
  • Journal article
    GARRAWAY BM, KNIGHT PL, STEINBACH J, 1995,

    DISSIPATION OF QUANTUM SUPERPOSITIONS - LOCALIZATION AND JUMPS

    , APPLIED PHYSICS B-LASERS AND OPTICS, Vol: 60, Pages: S63-S68, ISSN: 0946-2171
  • Conference paper
    THOMPSON RC, 1995,

    PERSONAL RECOLLECTIONS OF RADIATION BIOLOGY RESEARCH AT HANFORD

    , Symposium on Radiobiology and Dosimetry of Inhaled Radionuclides, Publisher: NUCLEAR TECHNOLOGY PUBL, Pages: 275-278, ISSN: 0144-8420
  • Journal article
    RUDOLPH T, FICEK Z, DALTON B, 1995,

    2-ATOM RESONANCE FLUORESCENCE IN RUNNING-WAVE AND STANDING-WAVE LASER FIELDS

    , Vol: 52, Pages: 636-656
  • Conference paper
    Steinbach J, Garraway BM, Knight PL, 1995,

    Attractor states in dissipative quantum optical systems

    , Bratislava, 3rd central-european workshop on quantum optics APR 28-MAY 01, 1995 BUDMERICE CASTLE, SLOVAKIA, Publisher: Slovak Academy Sciences Institute Physics, Pages: 289-302
  • Conference paper
    SCHILK AJ, KNOPF MA, THOMPSON RC, HUBBARD CW, ABEL KH, EDWARDS DR, ABRAHAM JRet al., 1994,

    REAL-TIME, IN-SITU DETECTION OF SR-90 AND U-238 IN SOILS VIA SCINTILLATING-FIBER-SENSOR TECHNOLOGY

    , 8th Symposium on Radiation Measurements and Applications, Publisher: ELSEVIER SCIENCE BV, Pages: 477-481, ISSN: 0168-9002
  • Conference paper
    Horvath GZK, Thompson RC, 1994,

    Simulations of laser cooling in a penning trap

    , Pages: 3-4

    Available information is often limited from ion trapping experiments about the effectiveness of the laser cooling and the exact state of motion of the trapped ions. For this reason, we have performed extensive simulations of the motion of ions experiencing laser cooling in a Penning trap. We are then able to use the results of the simulations both to interpret the experimental results we obtain and also to guide future experiments.
  • Conference paper
    Sauer BE, Hinds EA, Wang J, 1994,

    YbF - a new way to measure the electron electric dipole moment

    Heavy diatomic <sup>2</sup>Σ or <sup>2</sup>Π molecules were considered to be spectaculary sensitive systems to search for a permanent electric dipole moment (EDM) of the electron. To devise a molecular beam experiment using this kind of molecule, a variety of candidate molecules were considered. The YbF compound was chosen at the molecular beam and the production and detection methods for the molecules were studied. Several chemical mixtures were utilized to measure YbF production efficiency. Using both the hot wire and laser induced fluorescence, YbF was detected. Narrow linewidth of the crossed laser molecular beam apparatus was utilized to determine the spin-rotation and hyperfine splitting constants of the YbF molecule.
  • Journal article
    CONNERADE JP, DROUNGAS G, ELLIOTT R, HE X, KARAPANAGIOTI N, FAROOQ MA, MA H, MARANGOS JP, NAWAZ Met al., 1994,

    MANY-ELECTRON ATOMS IN HIGH MAGNETIC-FIELDS (VOL 27, PG 2753, 1994)

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 27, Pages: 5573-5573, ISSN: 0953-4075
  • Journal article
    Kim MS, Allen L, Loudon R, 1994,

    Quantum theory of radiation pressure on a dielectric slab

    , Physical Review A, Vol: 50, Pages: 3614-3626, ISSN: 1050-2947
  • Journal article
    DALTON BJ, FICEK Z, KNIGHT PL, 1994,

    OPTIMUM FIELD SQUEEZING FROM ATOMIC SOURCES - 3-LEVEL ATOMS

    , PHYSICAL REVIEW A, Vol: 50, Pages: 2646-2666, ISSN: 2469-9926
    • Cite
    • Citations: 21
  • Journal article
    FICEK Z, DALTON BJ, KNIGHT PL, 1994,

    STEADY-STATE SQUEEZING IN A DRIVEN 3-LEVEL LAMBDA-SYSTEM

    , PHYSICAL REVIEW A, Vol: 50, Pages: 2594-2598, ISSN: 2469-9926
    • Cite
    • Citations: 13
  • Journal article
    GARRAWAY BM, KNIGHT PL, 1994,

    EVOLUTION OF QUANTUM SUPERPOSITIONS IN OPEN ENVIRONMENTS - QUANTUM TRAJECTORIES, JUMPS, AND LOCALIZATION IN PHASE-SPACE

    , PHYSICAL REVIEW A, Vol: 50, Pages: 2548-2563, ISSN: 2469-9926
    • Cite
    • Citations: 70
  • Journal article
    CIARROCCA M, MARANGOS JP, BURGESS DD, HUTCHINSON MHR, SMITH RA, RAE SC, BURNETT Ket al., 1994,

    SPECTRAL AND SPATIAL MODIFICATIONS TO AN INTENSE 1-MU-M LASER-PULSE INTERACTING WITH A DENSE ARGON GAS

    , OPTICS COMMUNICATIONS, Vol: 110, Pages: 425-434, ISSN: 0030-4018
  • Journal article
    BUZEK V, GANTSOG T, KIM M, 1994,

    PRODUCTION OF MACROSCOPIC SCHRODINGER CAT STATES FROM WEAK QUANTIZED CAVITY FIELDS INTERACTING WITH ATOMS DRIVEN BY CLASSICAL FIELDS

    , JOURNAL OF MODERN OPTICS, Vol: 41, Pages: {1625-1635}-{1625-1635}, ISSN: 0950-0340

    We show that macroscopic superposition (Schrodinger cat) states of a quantized single-mode cavity field can be produced via the interaction of this field with a two-level atom which is driven by a classical field even for small initial intensities of the quantized cavity mode. We show that with a properly chosen driving field an almost pure superposition state with arbitrary amplitudes and phases of component states can be produced.
  • Journal article
    MOYACESSA H, KNIGHT PL, ROSENHOUSEDANTSKER A, 1994,

    PHOTON AMPLIFICATION IN A 2-PHOTON LOSSLESS MICROMASER

    , PHYSICAL REVIEW A, Vol: 50, Pages: 1814-1821, ISSN: 1050-2947
  • Journal article
    STARCZEWSKI T, LARSSON J, WAHLSTROM CG, TISCH JWG, SMITH RA, MUFFETT JE, HUTCHINSON MHRet al., 1994,

    TIME-RESOLVED HARMONIC-GENERATION IN AN IONIZING GAS

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 27, Pages: 3291-3301, ISSN: 0953-4075
  • Journal article
    CONNERADE JP, DROUNGAS G, ELLIOTT R, HE X, KARAPANAGIOTI N, FAROOQ MA, MA H, MARANGOS JP, NAWAZ Met al., 1994,

    MANY-ELECTRON ATOMS IN HIGH MAGNETIC-FIELDS

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 27, Pages: 2753-2770, ISSN: 0953-4075
  • Journal article
    LEE K, KIM M, BUZEK V, 1994,

    AMPLIFICATION OF MULTICOMPONENT SUPERPOSITIONS OF COHERENT STATES OF LIGHT WITH QUANTUM AMPLIFIERS

    , JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, Vol: 11, Pages: {1118-1129}-{1118-1129}, ISSN: 0740-3224

    We analyze statistical properties of multicomponent superpositions of coherent states of light amplified by quantum-mechanical amplifiers with reduced quantum fluctuations. We show that sub-Poissonian (i.e., amplitude-squeezed) amplifiers can transform any initial superposition of coherent states of light into a nonclassical state with a high degree of sub-Poissonian photon statistics. Simultaneously the shape of the photon-number distribution of the initial state of light is preserved but shifted toward higher photon numbers. On the other hand, we show that phase-sensitive (i.e., quadrature-squeezed) amplifiers may preserve the initial reduction of quadrature fluctuations (quadrature squeezing). We show that by using amplifiers with reduced quantum noise one can, in principle, control the influence of the noise transferred from the amplifier to the system.
  • Conference paper
    THOMPSON RC, DHOLAKIA K, HORVATH GZK, POWER W, SEGAL DMet al., 1994,

    SPECTROSCOPY OF LASER-COOLED IONS

    , 11th National Quantum Electronics Conference, Publisher: TAYLOR & FRANCIS LTD, Pages: 1087-1098, ISSN: 0950-0340
  • Conference paper
    TISCH JWG, SMITH RA, CIARROCCA M, MUFFETT JE, MARANGOS JP, HUTCHINSON MHRet al., 1994,

    ANGULARLY-RESOLVED HIGH-ORDER HARMONIC-GENERATION IN HELIUM

    , 11th National Quantum Electronics Conference, Publisher: TAYLOR & FRANCIS LTD, Pages: 1163-1172, ISSN: 0950-0340

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