Can We Distinguish Between the Grand Canonical and the Canonical Ensemble in a BEC Experiment?It is well known that at the thermodynamic limit there are no observable differences in the results obtained by grand canonical and canonical descriptions of a many-body system. In the present paper,…C. Herzog, M. Ol'Shanii·Sep 30, 1996SaveLearn
Operational Theory of Homodyne DetectionWe discuss a balanced homodyne detection scheme with imperfect detectors in the framework of the operational approach to quantum measurement. We show that a realistic homodyne measurement is…Konrad Banaszek, Krzysztof Wodkiewicz·Sep 27, 1996SaveLearn
Quantized Fields in a Nonlinear Dielectric Medium: A Microscopic ApproachTheories which have been used to describe the quantized electromagnetic field interacting with a nonlinear dielectric medium are either phenomenological or derived by quantizing the macroscopic…Mark Hillery, Leonard Mlodinow·Aug 26, 1996SaveLearn
A magnetic tomography of a cavity stateA method to determine the state of a single quantized cavity mode is proposed. By adiabatic passage, the quantum state of the field is transfered completely onto an internal Zeeman sub-manifold of an…R. Walser, J. I. Cirac, P. Zoller·Aug 19, 1996SaveLearn
Spin-rotation coupling in ferromagnetic clustersWe examine the magnetic response of free clusters considering the spin direction and the cluster orientation as the only active degrees of freedom. The average magnetization in small fields…G. F. Bertsch, V. Visuthikraisee·Jul 25, 1996SaveLearn
Nature of the Darwin term and (Zα)4 m3/M2 contribution to the Lamb shift for an arbitrary spin of the nucleusThe contact Darwin term is demonstrated to be of the same origin as the spin-orbit interaction. The (Zα)4 m3/M2 correction to the Lamb shift, generated by the Darwin term, is found for an…I. B. Khriplovich, A. I. Milstein, R. A. Sen'kov·Jul 19, 1996SaveLearn
Ursell Operators in Statistical Physics III: thermodynamic properties of degenerate gasesWe study in more detail the properties of the generalized Beth Uhlenbeck formula obtained in a preceding article. This formula leads to a simple integral expression of the grand potential of the…P. Grüter, F. Laloë, A. E. Meyerovich et al.·Jul 18, 1996SaveLearn
Centrifugal Effects in a Bose-Einstein CondensateSingle particle states in the atomic trap employing the rotating magnetic field are found using the full time-dependent instantaneous trapping potential. These states are compared with those of the…A. B. Kuklov, N. Chencinski, A. M. Levine et al.·Jul 17, 1996SaveLearn
Variational calculations of dispersion coefficients for interactions between H, He, and Li atomsThe dispersion coefficients C6, C8, and C10 for the interactions between H, He, and Li are calculated using variational wave functions in Hylleraas basis sets with multiple exponential…Zong-Chao Yan, James F. Babb, A. Dalgarno et al.·Jul 10, 1996SaveLearn
State Measurements with Short Laser Pulses and Lower-Efficiency Photon DetectorsIt has been proposed by Cook (Phys. Scr. T 21, 49 (1988)) to use a short probe laser pulse for state measurements of two-level systems. In previous work we have investigated to what extent this…Almut Beige, Gerhard C. Hegerfeldt·Jul 5, 1996SaveLearn
The energy dependence of relativistic nonradiative electron captureThe energy dependence of the nonradiative electron capture cross-section is discussed in the relativistic domain. A simple analytic expression is obtained for inner-shell transitions using…J F McCann, J T Glass, D S F Crothers·Jun 25, 1996SaveLearn
Electron Impact Excitation Cross Sections for Hydrogen-Like IonsWe present cross sections for electron-impact-induced transitions n --> n' in hydrogen-like ions C 5+, Ne 9+, Al 12+, and Ar 17+. The cross sections are computed by Coulomb-Born with exchange and…V. Fisher, Yu. V. Ralchenko, V. Bernshtam et al.·Jun 20, 1996SaveLearn
Stimulation of Beta Decay due to a Bose-Einstein CondensateNuclear processes can be stimulated by the presence of a macroscopic number of bosons in one of the final states. We describe the conditions necessary to observe the atom-stimulation of a beta decay…J. J. Hope, C. M. Savage·Jun 20, 1996SaveLearn
Analytic Description of the Motion of a Trapped Ion in an Even or Odd Squeezed StateA completely analytic description is given of the motion of a trapped ion which is in either an even or an odd squeezed state. Comparison is made to recent results on the even or odd coherent states,…Michael Martin Nieto·Jun 17, 1996SaveLearn
Interference of Bose condensatesWe investigate the prospects of atomic interference using samples of Bose condensed atoms. First we show the ability of two independent Bose condensates to create an interference pattern, even if…M. Naraschewski, H. Wallis, A. Schenzle et al.·Jun 17, 1996SaveLearn
Continuous Observation of Interference Fringes from Bose CondensatesWe use continuous measurement theory to describe the evolution of two Bose condensates in an interference experiment. It is shown how the system evolves in a single run of the experiment into a state…J. I. Cirac, C. W. Gardiner, M. Naraschewski et al.·Jun 17, 1996SaveLearn
Bloch oscillations: atom optical interpretation, realizations, and applicationsThe cyclic motion of particles in a periodic potential under the influence of a constant external force is analyzed in an atom optical approach based on Landau-Zener transitions between two resonant…Karl-Peter Marzlin, Juergen Audretsch·Jun 5, 1996SaveLearn
Influence of radiative interatomic collisions on an atom laserWe discuss the role of light absorption by pairs of atoms (radiative collisions) in the context of a model for an atom laser. The model is applied to the case of VSCPT cooling of metastable triplet…T. W. Hijmans, G. V. Shlyapnikov, A. L. Burin·Jun 3, 1996SaveLearn
Evolution of a Bose-condensed gas under variations of the confining potentialWe discuss the dynamic properties of a trapped Bose-condensed gas under variations of the confining field and find analytical scaling solutions for the evolving coherent state (condensate). We…Yu. Kagan, E. L. Surkov, G. V. Shlyapnikov·Jun 3, 1996SaveLearn
Analytic Description of the Motion of a Trapped Ion in an Even or Odd Coherent StateA completely analytic description is given of the motion of a trapped ion which is in either an even or an odd coherent state. Comparison to recent theoretical and experimental work is made.Michael Martin Nieto·May 24, 1996SaveLearn
Three-body recombination of ultra-cold atoms to a weakly bound s levelWe discuss three-body recombination of ultra-cold atoms to a weakly bound s level. In this case, characterized by large and positive scattering length a for pair interaction, we find a repulsive…P. O. Fedichev, M. W. Reynolds, G. V. Shlyapnikov·May 24, 1996SaveLearn
Influence of nearly resonant light on the scattering length in low-temperature atomic gasesWe develop the idea of manipulating the scattering length a in low-temperature atomic gases by using nearly resonant light. As found, if the incident light is close to resonance with one of the…P. O. Fedichev, Yu. Kagan, G. V. Shlyapnikov et al.·May 24, 1996SaveLearn
Single-Mode Cavity-QED of a Raman InteractionWe consider a single Rydberg atom having two degenerate levels interacting with the radiation field in a single-mode ideal cavity. The transition between the levels is carried out by a Λ-type…N. Nayak, S. S. Hassan, T. Biswas·May 22, 1996SaveLearn
Actio causes reactio: Gravito-optical trapping of three-level atomsWe investigate an atomic three-level Λ-system which is exposed to two counterpropagating laser fields (inducing Raman transitions) and which is closed by a magnetic hyperfine field tuned to be in…Karl-Peter Marzlin, Jürgen Audretsch·May 22, 1996SaveLearn
Hyperfine interactions between electronsThe relativistic Breit Hamiltonian between electrons is transformed into an effective vector potential Ai for the i.th electron, Ai having the structure of a recoil--corrected…R. Haeckl, H. Pilkuhn·May 22, 1996SaveLearn