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  • Journal article
    Hinds EA, Calarco T, Jaksch D, Schmiedmayer J, Cirac JI, Zoller Pet al., 2000,

    Quantum gates with neutral atoms: controlled collisional interactions in time-dependent traps

    , Physical Review A, ISSN: 1050-2947
  • Journal article
    Hinds EA, Rosenbusch, Retter, Hall, Lison, Haubrich, Meschedeet al., 2000,

    Reflection of cold atoms by a cobalt single crystal

    , Applied Physics B, ISSN: 0946-2171
  • Journal article
    Rosenbusch P, Hall BV, Hughes IG, Saba CV, Hinds EAet al., 2000,

    Manipulation of cold atoms by an adaptable magnetic reflector

    , Applied Physics B: Lasers and Optics, Vol: 70, Pages: 709-720, ISSN: 0946-2171

    Adaptive optics for cold atoms has been experimentally realized by applying a bias magnetic field to a static magnetic mirror. The mirror consist of a 12-mm-diameter piece of commercial videotape, having a sine wave of wavelength 25.4 μm recorded in a single track across its width, curved to form a concave reflector with radius of curvature R = 54 mm. We have studied the performance of the mirror by monitoring the evolution of a 24 μK cloud of 85Rb atoms bouncing on it. A uniform static external magnetic field was added to the mirror field causing a corrugated potential from which the atoms bounce with increased angular spread. The characteristic angular distribution of the surface normal is mapped at the peak of the bounce for atoms dropped from a height of R/2 and at the peak of the second bounce for a drop height of R/4. In a second experiment a time-dependent magnetic field was applied and the angular distribution of the cloud was measured as a function of field frequency. In this scheme we demonstrate a corrugated potential whose time-dependent magnitude behaves like a diffraction grating of variable depth. Finally a rotating field was added to generate a corrugated potential that moves with a velocity given by the product of the external field rotation frequency and the videotape wavelength. This travelling grating provides a new method of manipulation as cold atoms are transported across the surface by surfing along the moving wave. Two theoretical methods have been developed to predict the behaviour of atoms reflecting from these stationary, variable magnitude and moving corrugated potentials. A simple analytic theory provides excellent agreement for reflection from a stationary corrugated potential and gives good agreement when extended to the case of a travelling grating. A Monte Carlo simulation was also performed by brute force numeric-integration of the equations of motion for atoms reflecting from all three corrugated potential cases.
  • Journal article
    Pendlebury JM, Hinds EA, 2000,

    Particle electric dipole moments

    , Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol: 440, Pages: 471-478, ISSN: 0168-9002

    Measurements of particle electric dipole moments (EDMs) continue to put power constraints on theories of T-symmetry and CP-symmetry violation, which form currently one of the most prominent fields in particle physics. EDM measurements have been concentrated on neutral systems such as the neutron and atoms and molecules. These measurements allow one to deduce, in turn, the electric dipole moments of the fundamental fermions, that is, the lighter leptons and quarks and also those of some heavy nuclei.
  • Journal article
    Rosenbusch P, Hall BV, Hughes IG, Saba CV, Hinds EAet al., 2000,

    Manipulation of cold atoms using a corrugated magnetic reflector

    , Physical Review A - Atomic, Molecular, and Optical Physics, Vol: 61, Pages: 314041-314044, ISSN: 1050-2947

    A corrugated magnetic reflector is realized by adding a bias field to a static magnetic mirror. This permits real-time manipulation of a cold-atom cloud on time scales down to 100 μs. We show that rotation of the bias field generates a traveling corrugation of adjustable depth and velocity. Momentum is transferred from the traveling wave to the atoms, resulting in a displacement of the cloud that depends on the wave velocity. This is a step towards a new method of manipulation in which neutral atoms could be transported across the surface by surfing along the moving wave.
  • Journal article
    Hinds E, 2000,

    Chips get closer to quantum computing

    , Physics World, Vol: 13, Pages: 25-26, ISSN: 0953-8585
  • Journal article
    Rosenbusch P, Retter JA, Hall BV, Hinds EA, Lison F, Haubrich D, Meschede Det al., 2000,

    Reflection of cold atoms by a cobalt single crystal

    , Applied Physics B: Lasers and Optics, Vol: 70, Pages: 661-663, ISSN: 0946-2171

    We have demonstrated that a cobalt single crystal can be used to make a remarkably smooth retro-reflector for cold paramagnetic atoms. The crystal is cut so that its surface lies in the (0001) plane and the atoms are reflected by the magnetic field above the surface due to the self-organized pattern of magnetic domains in the material. We find that the reflectivity for suitably polarized atoms exceeds 90% and may well be unity. We use the angular spread of a reflected atom cloud to measure the roughness of the mirror. We find that the angular variation of the equivalent hard reflecting surface is (3.1 ± 0.3°)rms for atoms dropped onto the mirror from a height of 2 cm.
  • Journal article
    Hinds EA, Eberlein C, 2000,

    Quantum propagation of neutral atoms in a magnetic quadrupole guide

    , Physical Review A - Atomic, Molecular, and Optical Physics, Vol: 61, Pages: 336141-3361413, ISSN: 1050-2947

    We consider the quantized motion of neutral atoms at very low temperature in a two-dimensional magnetic quadrupole structure formed, for example, by four current-carrying wires along the z direction. The magnetic field B in the guide is proportional to the vector (x, - y). We show that this field can be used to make a single-mode atomic de Broglie waveguide which has bound states of low angular momentum, even though the field at the center of the guide goes to zero. We investigate the spectrum and decay rate of the transverse modes for spin-1/2 and spin-1 atoms.
  • Journal article
    Calarco T, Hinds EA, Jaksch D, Schmiedmayer J, Cirac JI, Zoller Pet al., 2000,

    Quantum gates with neutral atoms: Controlling collisional interactions in time-dependent traps

    , Physical Review A - Atomic, Molecular, and Optical Physics, Vol: 61, Pages: 223041-2230411, ISSN: 1050-2947

    We theoretically study specific schemes for performing a fundamental two-qubit quantum gate via controlled atomic collisions by switching microscopic potentials. In particular we calculate the fidelity of a gate operation for a configuration where a potential barrier between two atoms is instantaneously removed and restored after a certain time. Possible implementations could be based on microtraps created by magnetic and electric fields, or potentials induced by laser light.
  • Conference paper
    Powell H, Irvine W, van Eijkelenborg MA, Segal DM, Thompson RCet al., 2000,

    Studies of quantum jumps in a single <sup>25</sup>Mg<sup>+</sup> ion held in a Penning trap

    A study of quantum jumps in single magnesium ions held in a Penning trap was presented. Single 24Mg+ ions were experimentally studied in a Penning trap, which a number of interesting effects that occurs only in 25Mg+ are predicted and observed. Results show that the novel features in the behaviour of 25Mg+ are due to the presence of hyperfine structure in this ion.
  • Journal article
    Beige A, Huelga SF, Knight PL, Plenio MB, Thompson RCet al., 2000,

    Coherent manipulation of two dipole—dipole interacting ions

    , Journal of Modern Optics, Vol: 47-2, Pages: 401-414, ISSN: 0950-0340

    We investigate to what extent two trapped ions can be manipulated coherently when their coupling is mediated by a dipole—dipole interaction. We will show how the resulting level shift induced by this interaction can be used to create entanglement, while the decay of the states remains nearly negligible. This will allow us to implement conditional dynamics (a CNOT gate) and single qubit operations. We propose two different experimental realizations where a large level shift can be achieved and discuss both the strengths and weaknesses of this scheme from the point of view of a practical realization. © 2000 Taylor & Francis Group, LLC.
  • Conference paper
    Rogel-Salazar J, New GHC, Chavez-Cerda S, 2000,

    Non-diffractive laser resonators

    A Bessel-beam laser based on an optical resonator was considered and a computational model of cavity incorporating an axicon was also investigated. Parameters such as the use of plane output mirror and varied cavity length propagation were used. The simulation results confirmed the modes of the cavity as Bessel beams were simple transverse standing waves. Bessel beams representative of Hankel functions, were fundamental travelling-wave solutions of Helmholtz reduced wave equations.
  • Conference paper
    Merimeche H, Bertram R, Haubrich D, Mutzel M, Rosenbusch P, Hinds EA, Meschede Det al., 2000,

    Large angle guiding of atomic beams by magnetized video tape

    The deflection of a collimated and polarized cesium atomic beam was investigated by a sinusoidally magnetized video tape with a period length of 30 μm. From these measurements, the magnetic field strength at the surface was determined to be 0.05 Tesla. The reflectivity was found to be consistent with 100%.
  • Journal article
    Rosenbusch P, Hall BV, Hughes IG, Saba CV, Hinds EAet al., 2000,

    Manipulation of cold atoms using a corrugated magnetic reflector

    , Physical Review A - Atomic, Molecular, and Optical Physics, Vol: 61, ISSN: 1050-2947

    A corrugated magnetic reflector is realized by adding a bias field to a static magnetic mirror. This permits real-time manipulation of a cold-atom cloud on time scales down to 100 μs. We show that rotation of the bias field generates a traveling corrugation of adjustable depth and velocity. Momentum is transferred from the traveling wave to the atoms, resulting in a displacement of the cloud that depends on the wave velocity. This is a step towards a new method of manipulation in which neutral atoms could be transported across the surface by surfing along the moving wave. © 2000 The American Physical Society.
  • Journal article
    Dorman C, Kucukkara I, Marangos JP, 2000,

    Measurement of high conversion efficiency to 123.6-nm radiation in a four-wave-mixing scheme enhanced by electromagnetically induced transparency

    , PHYSICAL REVIEW A, Vol: 61, ISSN: 1050-2947
  • Journal article
    Myers EG, Tarbutt MR, 2000,

    Measurement of the 1<i>s</i>2<i>p</i> <SUP>3</SUP><i>P</i><sub>0</sub>-<SUP>3</SUP><i>P</i><sub>1</sub> fine-structure interval in heliumlike magnesium -: art. no. 010501

    , PHYSICAL REVIEW A, Vol: 61, ISSN: 1050-2947
  • Conference paper
    Myers EG, Hankins R, Silver JD, Tarbutt MRet al., 2000,

    Precision Lamb-shift measurement in hydrogenic nitrogen by fast-beam laser spectroscopy

    , 1st Euroconference on Atomic Physics at Accelerators (APAC 99), Publisher: BALTZER SCI PUBL BV, Pages: 329-332, ISSN: 0304-3843
  • Journal article
    Springate E, Hay N, Tisch JWG, Mason MB, Ditmire T, Marangos JP, Hutchinson MHRet al., 2000,

    Enhanced explosion of atomic clusters irradiated by a sequence of two high-intensity laser pulses - art. no. 044101

    , Physical Review A, Vol: 6104, Pages: 4101-+, ISSN: 1050-2947
  • Conference paper
    Dorman C, Kucukkara I, Anscombe M, Semaoune R, Marangos JPet al., 2000,

    High efficiency frequency up-conversion enhanced by electromagnetically induced transparency

    , Berlin, international conference on laser physics and quantum optics AUG 25-28, 1999 SHANGHAI, PEOPLES R CHINA, Publisher: Springer-Verlag Berlin, Pages: 345-356
  • Conference paper
    Codling K, Posthumus JH, Frasinski LJ, 2000,

    Manipulating molecules with intense lasers

    , 21st International Conference on the Physics of Electronic and Atomic Collisions (21st ICPEAC), Publisher: AMER INST PHYSICS, Pages: 3-22, ISSN: 0094-243X
  • Journal article
    Lappas DG, Corso PP, Knight PL, 2000,

    Effects of pulse duration and wavelength on the nonsequential ionization of helium

    , Multiphoton Processes, Vol: 525, Pages: 245-256, ISSN: 0094-243X
  • Book chapter
    Villeneuve DM, Aseyev S, Ivanov MY, Dietrich P, Corkum PBet al., 2000,

    Molecular Optics - Using lasers to push molecules around

    , Proceeding of Lasers-99, Editors: Corcoran, Corcoran, Publisher: STS Press, McLean
  • Journal article
    Villeneuve DM, Aseyev SA, Dietrich P, Spanner M, Ivanov MY, Corkum PBet al., 2000,

    Forced molecular rotation in an optical centrifuge

    , PHYSICAL REVIEW LETTERS, Vol: 85, Pages: 542-545, ISSN: 0031-9007

    Intense linearly polarized light induces a dipole force that aligns an anisotropic molecule to the direction of the field polarization. Rotating the polarization causes the molecule to rotate. Using femtosecond laser technology, we accelerate the rate of rotation from 0 to 6 THz in 50 ps, spinning chlorine molecules from near rest up to angular momentum states J similar to 420. At the highest spinning rate, the molecular bond is broken and the molecule dissociates.
  • Conference paper
    Frasinski LJ, Divall EJ, Langley AJ, Posthumus JH, Plumridge J, Taday PF, Codling Ket al., 2000,

    Bond hardening and zero-photon dissociation in H<sub>2</sub><SUP>+</SUP>

    , 8th International Conference on Multiphoton Processes (ICOMP VIII), Publisher: AMER INST PHYSICS, Pages: 450-460, ISSN: 0094-243X
  • Journal article
    RUDOLPH T, 2000,

    Better schemes for quantum interrogation in lossy experiments

    , Vol: 85, Pages: 2925-2928
  • Conference paper
    Tarbutt MR, Mokler PH, Myers EG, Silver JDet al., 2000,

    X-ray spectroscopic intercomparison between hydrogenic ions of different <i>Z</i> as a method for determining Lamb shifts

    , 1st Euroconference on Atomic Physics at Accelerators (APAC 99), Publisher: SPRINGER INTERNATIONAL PUBLISHING AG, Pages: 333-337, ISSN: 0304-3843
  • Conference paper
    Myers EG, Thompson JK, Margolis HS, Silver JD, Tarbutt MRet al., 2000,

    Lamb shift, fine structure and hyperfine structure in helium-like ions by fast-beam laser spectroscopy

    , 1st Euroconference on Atomic Physics at Accelerators (APAC 99), Publisher: BALTZER SCI PUBL BV, Pages: 323-328, ISSN: 0304-3843
  • Conference paper
    Bose S, Huelga SF, Jonathan D, Knight PL, Murao M, Plenio MB, Vedral Vet al., 2000,

    Manipulation of entangled states for quantum information processing

    , 4th International Conference on Quantum Communication, Measurement, and Computing, Publisher: KLUWER ACADEMIC/PLENUM PUBL, Pages: 49-58
  • Journal article
    Patel A, Kylstra NJ, Knight PL, 1999,

    Effect of laser pulse shapes on the stabilization of a model atom

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 32, Pages: 5759-5778, ISSN: 0953-4075
  • Journal article
    Paspalakis E, Angelakis DG, Knight PL, 1999,

    The influence of density of modes on dark lines in spontaneous emission

    , OPTICS COMMUNICATIONS, Vol: 172, Pages: 229-240, ISSN: 0030-4018

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