Thermal Motion

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D J Wineland - One of the best experts on this subject based on the ideXlab platform.

  • quantum logic spectroscopy with ions in Thermal Motion
    Physical Review X, 2020
    Co-Authors: D Kienzler, Yong Wan, Stephen Erickson, A C Wilson, D J Wineland
    Abstract:

    An enhanced version of quantum logic spectroscopy, used to map absorption and emission from single atoms, tolerates some ion Motion and entangles several ions for improved sensitivity.

  • quantum logic spectroscopy with ions in Thermal Motion
    arXiv: Atomic Physics, 2019
    Co-Authors: D Kienzler, Yong Wan, Stephen Erickson, A C Wilson, D J Wineland
    Abstract:

    A mixed-species geometric phase gate has been proposed for implementing quantum logic spectroscopy on trapped ions that combines probe and information transfer from the spectroscopy to the logic ion in a single pulse. We experimentally realize this method, show how it can be applied as a technique for identifying transitions in currently intractable atoms or molecules, demonstrate its reduced temperature sensitivity, and observe quantum-enhanced frequency sensitivity when it is applied to multi-ion chains. Potential applications include improved readout of trapped-ion clocks and simplified error syndrome measurements for quantum error correction.

R. W. Henning - One of the best experts on this subject based on the ideXlab platform.

  • maximum entropy method analysis of Thermal Motion and disorder in thermoelectric clathrate ba8ga16si30
    Journal of Applied Physics, 2002
    Co-Authors: Anders Bentien, Bo B. Iversen, J. D. Bryan, Galen D. Stucky, A. E. C. Palmquist, Arthur J. Schultz, R. W. Henning
    Abstract:

    Multitemperature (15, 100, 150, 200, 300, 450, 600, 900 K) single crystal neutron diffraction data on the type I clathrate Ba8Ga16Si30 are reported. For the framework atoms reciprocal space structural refinements give total occupancies in the unit cell of Ga/Si=3.8/2.2, 1.8/14.2, 10.2/13.8 for the 6c, 16i, and 24k sites respectively, thus showing that Ga avoids the tetrahedral 16i positions. The guest atom displacement parameters obtained from structure factor fitting are analyzed with semianharmonic Einstein models giving Einstein temperatures (ΘE) of 69(1), 98(7), and 124(2) K for Ba(2)(100), Ba(2)[100], and Ba(1), respectively. The analysis furthermore suggests that all guest atoms are structurally disordered, and the disorder appears to be temperature dependent with increased host-guest interaction at high temperatures. The structure factors are subsequently used in the maximum entropy method calculations to obtain direct space nuclear densities. These are modeled with anharmonic one-particle potential models to fourth order. Even at elevated temperatures anharmonicity is limited indicating that the low Thermal conductivity of the clathrate has a different origin.

  • Maximum entropy method analysis of Thermal Motion and disorder in thermoelectric clathrate Ba8Ga16Si30
    Journal of Applied Physics, 2002
    Co-Authors: Anders Bentien, Bo B. Iversen, J. D. Bryan, Galen D. Stucky, A. E. C. Palmquist, Arthur J. Schultz, R. W. Henning
    Abstract:

    Multitemperature (15, 100, 150, 200, 300, 450, 600, 900 K) single crystal neutron diffraction data on the type I clathrate Ba8Ga16Si30 are reported. For the framework atoms reciprocal space structural refinements give total occupancies in the unit cell of Ga/Si=3.8/2.2, 1.8/14.2, 10.2/13.8 for the 6c, 16i, and 24k sites respectively, thus showing that Ga avoids the tetrahedral 16i positions. The guest atom displacement parameters obtained from structure factor fitting are analyzed with semianharmonic Einstein models giving Einstein temperatures (ΘE) of 69(1), 98(7), and 124(2) K for Ba(2)(100), Ba(2)[100], and Ba(1), respectively. The analysis furthermore suggests that all guest atoms are structurally disordered, and the disorder appears to be temperature dependent with increased host-guest interaction at high temperatures. The structure factors are subsequently used in the maximum entropy method calculations to obtain direct space nuclear densities. These are modeled with anharmonic one-particle potentia...

Klaus Molmer - One of the best experts on this subject based on the ideXlab platform.

  • entanglement and quantum computation with ions in Thermal Motion
    Physical Review A, 2000
    Co-Authors: Anders S Sorensen, Klaus Molmer
    Abstract:

    With bichromatic fields, it is possible to deterministically produce entangled states of trapped ions. In this paper we present a unified analysis of this process for both weak and strong fields, for slow and fast gates. Simple expressions for the fidelity of creating maximally entangled states of two or an arbitrary number of ions under nonideal conditions are derived and discussed.

  • quantum computation with ions in Thermal Motion
    Physical Review Letters, 1999
    Co-Authors: Anders S Sorensen, Klaus Molmer
    Abstract:

    We propose an implementation of quantum logic gates via virtual vibrational excitations in an ion-trap quantum computer. Transition paths involving unpopulated vibrational states interfere destructively to eliminate the dependence of rates and revolution frequencies on vibrational quantum numbers. As a consequence, quantum computation becomes feasible with ions whose vibrations are strongly coupled to a Thermal reservoir.

  • multiparticle entanglement of hot trapped ions
    Physical Review Letters, 1999
    Co-Authors: Klaus Molmer, Anders S Sorensen
    Abstract:

    We propose an efficient method to produce multiparticle entangled states of ions in an ion trap for which a wide range of interesting effects and applications have been suggested. Our preparation scheme exploits the collective vibrational Motion of the ions, but it works in such a way that this Motion need not be fully controlled in the experiment. The ions may, e.g., be in Thermal Motion and exchange mechanical energy with a surrounding heat bath without detrimental effects on the internal state preparation. Our scheme does not require access to the individual ions in the trap.

Anton Barty - One of the best experts on this subject based on the ideXlab platform.

  • damped and Thermal Motion of laser aligned hydrated macromolecule beams for diffraction
    Journal of Chemical Physics, 2005
    Co-Authors: D Starodub, Kevin Schmidt, Uwe Weierstall, J S Wu, J C H Spence, Malcolm R Howells, M Marcus, D A Shapiro, R B Doak, Anton Barty
    Abstract:

    We consider a monodispersed Rayleigh droplet beam of water droplets doped with proteins. An intense infrared laser is used to align these droplets. The arrangement has been proposed for electron- and x-ray-diffraction studies of proteins which are difficult to crystallize. This paper considers the effect of Thermal fluctuations on the angular spread of alignment in Thermal equilibrium, and relaxation phenomena, particularly the damping of oscillations excited as the molecules enter the field. The possibility of adiabatic alignment is also considered. We find that damping times in a high-pressure gas cell as used in x-ray-diffraction experiments are short compared with the time taken for molecules to traverse the beam and that a suitably shaped field might be used for electron-diffraction experiments in vacuum to provide adiabatic alignment, thus obviating the need for a damping gas cell.

  • damped and Thermal Motion of large laser aligned molecules in droplet beams
    Journal of Chemical Physics, 2005
    Co-Authors: D Starodub, B Doak, Kevin Schmidt, Uwe Weierstall, J S Wu, J C H Spence, Malcolm R Howells, M Marcus, D A Shapiro, Anton Barty
    Abstract:

    We consider a monodispersed Rayleigh droplet beam of water droplets doped with proteins. An intense infrared laser is used to align these droplets. The arrangement has been proposed for electron and X-ray diffraction studies of proteins which are difficult to crystallize. This paper considers the effect of Thermal fluctuations on the angular spread of alignment in Thermal equilibrium, and relaxation phenomena, particularly the damping of oscillations excited as the molecules enter the field. The possibility of adiabatic alignment is also considered. We find that damping times in high pressure gas cell as used in X-ray diffraction experiments are short compared to the time taken for molecules to traverse the beam, and that a suitably shaped field might be used for electron diffraction experiments in vacuum to provide adiabatic alignment, thus obviating the need for a damping gas cell.

Shi-biao Zheng - One of the best experts on this subject based on the ideXlab platform.

  • Generation of entangled states of multiple trapped ions in Thermal Motion
    Physical Review A, 2004
    Co-Authors: Shi-biao Zheng
    Abstract:

    A scheme is presented for generating entangled states of the $\mathrm{W}$ type for trapped ions in Thermal Motion. In the scheme the ions are simultaneously excited by a laser. Our scheme is insensitive to both the initial Motional state and heating as long as the system remains in the Lamb-Dicke regime.

  • generation of entangled states for many multilevel atoms in a Thermal cavity and ions in Thermal Motion
    Physical Review A, 2003
    Co-Authors: Shi-biao Zheng
    Abstract:

    We propose a scheme for generating entangled states for two or more multilevel atoms in a Thermal cavity. The photon-number-dependent parts in the effective Hamiltonian are canceled with the assistance of a strong classical field. Thus the scheme is insensitive to both the cavity decay and the Thermal field. The scheme does not require individual addressing of the atoms in the cavity. The scheme can also be used to generate entangled states for many hot multilevel ions.

  • Quantum Logic Gates for Hot Ions without a Speed Limitation
    Physical review letters, 2003
    Co-Authors: Shi-biao Zheng
    Abstract:

    We propose a scheme for realizing two-qubit quantum phase gates with trapped ions in Thermal Motion. In the scheme, the ions are simultaneously illuminated by a standing-wave laser tuned to the carrier, which virtually excites several vibrational modes. The scheme puts no limitations on the intensity of the laser field, allowing the production of a quantum logic gate for hot ions with an arbitrarily high speed as long as a laser field of sufficiently high intensity is available.