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Cold Neutron Interferometry Using Multilayer Neutron Mirrors

100%
Kawai T.
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vol. 96
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issue 1
33-48
EN
The object of this report is to review the recent results and some perspectives on cold neutron interferometry using multilayer neutron mirrors developed in KUR. The purposes of our research are to develop new experimental techniques, new devices for controlling neutron spin states for opening up a new world of physics. A multilayer neutron polarizer working under a very low external magnetic field (low field magnetic mirror), Funahashi's interferometer, a cold neutron spin echo instrument, a multilayer neutron spin splitter and a cold neutron pulser were developed. The equivalency of the quantum precession induced by the effective gap layer of the multilayer neutron spin splitter and Larmor precession of neutron spin in a magnetic field is established. This idea allows us to develop a cold neutron phase-spin-echo interferometer (a neutron spin interferometer). The neutron spin interferometer and a cold neutron pulser enabled us to carry out the delayed choice experiment for answering the question "how the neutron wave propagates after being split by the semitransparent mirror (wave splitter)". These matters are reviewed in this paper.
2
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Harmonically Trapped Classical Gas under Critical Rotation

63%
Chwedeńczuk J., Ziń P., Trippenbach M., Dąbrowska B., Gajda M., Rzążewski K.
Acta Physica Polonica A
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2003
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vol. 104
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issue 5
399-407
EN
We study one- and two-dimensional systems of two interacting particles in a time dependent harmonic potential. In a case of one-dimensional geometry a frequency of the potential varies periodically, while in the two-dimen- sional~case the harmonic potential rotates with a constant angular velocity. We show that depending on the driving frequency the distance between the particles can either explode or stay bound. Repulsive interaction can prevent the explosion, which seems quite counter-intuitive. Our work is related to Ecole Normale Supérieure experiment and shows that the effect found there is purely classical.
3
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Entanglement of a Gas of Atomic Spins

51%
Bigelow N.
Acta Physica Polonica A
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2002
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vol. 101
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issue 3
449-457
EN
In this paper we discuss our recent work on the creation of massively entangled states of millions to trillions of thermal atomic spins. We consider the particular entangled states that are also spin-squeezed states.
4
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Adiabatic Processes in Quantum Optics

51%
Stenholm S.
Acta Physica Polonica A
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2002
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vol. 101
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issue 3
425-435
EN
This paper reviews the use of adiabatic approximations in quantum optics.The general principle is explained in terms of the Landau-Zener model and the recently developed stimulated Raman adiabatic passage scheme. The features characteristic of adiabatic evolution are extracted from these examples. Our recent work on adiabatic level preparation and cavity mode transfer of excitation is presented and discussed.
5
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Role of Correlations and Off-Diagonal Terms in Binary Disordered One-Dimensional Systems

51%
Kosior A., Major J., Płodzień M., Zakrzewski J.
Acta Physica Polonica A
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2015
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vol. 128
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issue 6
1002-1007
EN
We investigate one-dimensional tight binding model in the presence of a correlated binary disorder. The disorder is due to the interaction of particles with heavy immobile other species. Off-diagonal disorder is created by means of a fast periodic modulation of interspecies interaction. The method based on transfer matrix techniques allows us to calculate the energies of extended modes in the correlated binary disorder. We focus on N-mer correlations and regain known results for the case of purely diagonal disorder. For off-diagonal disorder we find resonant energies. We discuss ambiguous properties of those states and compare analytical results with numerical calculations. Separately we describe a special case of the dual random dimer model.
6
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Bright Solitons in Asymmetrically Trapped Bose-Einstein Condensates

51%
Golam Ali S., Talukdar B., Roy S.
Acta Physica Polonica A
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2007
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vol. 111
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issue 3
289-297
EN
We study the dynamics of bright solitons in a Bose-Einstein condensate confined in a highly asymmetric trap. While working within the framework of a variational approach we carry out the stability analysis of the Bose-Einstein condensate solitons against collapse. When the number of atoms in the soliton exceeds a critical number N_c, it undergoes the so-called primary collapse. We find an analytical expression for N_c in terms of appropriate experimental quantities that are used to produce and confine the condensate. We further demonstrate that, in the geometry of the problem considered, the width of the soliton varies inversely as the number of constituent atoms.
7
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Coherent Beam Splitting by a Thin Grating

45%
Božić M., Dimić D., Davidović M.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
479-482
EN
The wide use of beam splitters in quantum interferometry, attosecond metrology, modern quantum information processing, foundations of quantum mechanics, has been based on coherence of beams emerging from a beam splitter. Here we further develop the approach in which a beam splitter is regarded as a transformer of an incident wave field (photon field or matter wave field) into a field which has narrow maxima at the points along and in close vicinity of two or more particular lines. This description was derived by considering a thin grating as a model of a beam splitter for photons, atoms and molecules. It is applied to answer some questions raised in the discussions on the interpretation of wave particle duality.
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