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Wyświetlanie 1-15 z 143
Tytuł:
Quest for Ghz States
Autorzy:
Żukowski, M.
Zeilinger, A.
Horne, M. A.
Weinfurter, H.
Powiązania:
https://bibliotekanauki.pl/articles/1968537.pdf
Data publikacji:
1998-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Bz
42.50.Dv
89.70.+c
Opis:
The premises of the Einstein-Podolsky-Rosen argument for their claim that quantum mechanics is an incomplete theory are inconsistent when applied to three-particle systems in entangled Greenberger-Horne-Zeilinger states. However, thus far there is no experimental confirmation for existence of such states. We propose a technique to obtain Greenberger-Horne-Zeilinger states which rests upon an observation that when a single particle from two independent entangled pairs is detected in a manner such that it is impossible to determine from which pair the single came, the remaining three particles become entangled.
Źródło:
Acta Physica Polonica A; 1998, 93, 1; 187-195
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on Entanglement, its Sources and Applications
Autorzy:
Żukowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2030287.pdf
Data publikacji:
2002-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Ud
03.67.-a
42.50.Ar
Opis:
We shall discuss the central role played in the quantum information theory by entanglement. A generalized version of Bell's theorem will be presented, as well as methods in multiphoton interferometry to obtain correlations violating the Bell inequalities. Finally, we shall present some quantum informational applications of entanglement.
Źródło:
Acta Physica Polonica A; 2002, 101, 1; 21-35
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probing Higher Dimensions of Hilbert Space in Experiment
Autorzy:
Zeilinger, A.
Powiązania:
https://bibliotekanauki.pl/articles/1931274.pdf
Data publikacji:
1994-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Bz
42.50.Wm
Opis:
Using the correlated pairs produced in spontaneous parametric down-conversion, one can extract quantum states effectively defined in a Hilbert space of any dimension N. Furthermore, using just beam splitters and phase shifters one can build any unitary operator in the laboratory. We briefly discuss how this can be done, what kind of states could easily be produced in the laboratory, and we will discuss one explicit result pertaining to photon bunching in an N-dimensional Hilbert space.
Źródło:
Acta Physica Polonica A; 1994, 85, 4; 717-723
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaos Assisted Tunneling and Nonspreading Wave Packets
Autorzy:
Zakrzewski, J.
Delande, D.
Buchleitner, A.
Powiązania:
https://bibliotekanauki.pl/articles/1968540.pdf
Data publikacji:
1998-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.+b
32.80.Rm
42.50.Hz
Opis:
Consider an initial state lying on a primary resonance island. The state may tunnel into the chaotic sea surrounding it and further escape to infinity via chaotic diffusion. Properties of transport in such a situation are studied on an exemplary system - the hydrogen atom driven by microwaves. We show that the combination of tunneling followed by chaotic diffusion leads to peculiar large scale fluctuations of the AC Stark shift and ionization rates. An appropriate random matrix model describes accurately these statistical properties.
Źródło:
Acta Physica Polonica A; 1998, 93, 1; 179-186
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spontaneous Emission by Atoms in Simple Environments
Autorzy:
Żakowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/2030308.pdf
Data publikacji:
2002-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.-p
32.80.-t
03.70.+k
Opis:
Spontaneous radiation by atoms in the presence of the planar dielectric-vacuum interface, planar dielectric waveguides and cylindrical dielectric waveguides are discussed in the frame of cavity quantum electrodynamics in full analogy with that in free space. However, quantization of the electromagnetic field should be based on the modes appropriate to the selected space structure. These quantizations are usually based on incoming waves. However, the discussion of the angular intensity pattern of spontaneous emission can be simplified if the quantization is based on outgoing modes. Using these outgoing photons the angular emission radiation pattern has been obtained from a straightforward application of the perturbative method of the quantum radiation theory. Adding a contribution of the waveguiding photons attached to the waveguides (when they are present) the total emission of the spontaneous radiation and excitation decay rates of atoms radiating in these systems have been derived.
Źródło:
Acta Physica Polonica A; 2002, 101, 1; 119-131
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonclassical Properties of Para-Bose Superposition States
Autorzy:
Yu, Y.
Wang, D.
Powiązania:
https://bibliotekanauki.pl/articles/1808074.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Dv
03.65.Fd
Opis:
We investigate the nonclassical properties of para-Bose superposition states which involve the vacuum and one- or two-photon state of paraboson. It is found that these para-Bose superposition states exhibit stronger squeezing and antibunching. The amplitude-squared squeezing for these states is also examined.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 613-616
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physics of Solid-State Laser Materials
Autorzy:
Wojtowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1888052.pdf
Data publikacji:
1991-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Rz
78.50.-w
78.55.-m
Opis:
A survey of the physical properties of solid state materials activated with d$\text{}^{2}$, d$\text{}^{3}$ and d$\text{}^{8}$ transition metal ions is presented in the context of tunable laser operation. An emphasis is put on common characteristics of all three systems, like a strong electron-phonon coupling and similar electronic structures. The conditions necessary to obtain a tunable operation and to avoid an overlap of the excited state absorption and emission are formulated. It is shown that the d$\text{}^{3}$ configuration system has the largest range of allowed values of the crystal field parameter 10Dq.
Źródło:
Acta Physica Polonica A; 1991, 80, 2; 193-205
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classical Limit of Entangled Correlations
Autorzy:
Wódkiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/1931522.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Bz
42.50.Wm
Opis:
Generalizations of Bell's inequalities for Einstein Podolsky and Rosen entangled correlations for arbitrary spin s are discussed. Violations of local realism and the classical limit of quantum nonlocality for large s are discussed. The role of the polarization and of the spin alignment in the violation of the Bell inequalities are investigated. A Bayes analysis of entangled correlations is performed using the nonlocal quantum distribution. The local but nonpositive Einstein Podolsky and Rosen quantum distribution is investigated in the limit when s → ∞. The classical limit of the quantum Malus law for arbitrary spin s is formulated in terms of the spin path integrals.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 223-234
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent Population Trapping in Open and Closed Systems
Autorzy:
Windholz, L.
Powiązania:
https://bibliotekanauki.pl/articles/2012936.pdf
Data publikacji:
2000-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.-t
42.50.-p
Opis:
In the present paper, an overview on work concerning coherent population trapping within the hyperfine manifold of the sodium D$\text{}_{1}$-line is given. Besides manifestation of coherent population trapping for different Λ-schemes, also phase dependent processes in closed contour systems (four-level double Λ-schemes) are discussed, including the case of phase dependent electromagnetically induced transparency.
Źródło:
Acta Physica Polonica A; 2000, 97, 2; 259-274
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetically Induced Transparency in a Double Well Atomic Josephson Junction
Autorzy:
Weatherall, J.
Search, C.
Powiązania:
https://bibliotekanauki.pl/articles/1791182.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Gy
03.75.Lm
Opis:
Electromagnetically induced transparency is an important tool for controlling light propagation and nonlinear wave mixing in atomic gases with potential applications ranging from quantum computing to table top tests of general relativity. Here we consider electromagnetically induced transparency in an atomic Bose-Einstein condensate trapped in a double well potential. One well is prepared as in standard electromagnetically induced transparency with a weak probe laser and control laser in a Λp configuration while tunneling between the wells provides a coherent coupling between identical electronic states in the two wells leading to the formation of spatially delocalized inter-well dressed states. The macroscopic inter-well coherence of the Bose-Einstein condensate wave function qualitatively modifies the normal electromagnetically induced transparency linear susceptibility and leads to the formation of additional absorption resonances and larger dispersion than electromagnetically induced transparency. We show that these new resonances can be interpreted in terms of the inter-well dressed states and the formation of a novel type of dark state involving the control laser and the inter-well tunneling.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 455-459
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Wave Fields
Autorzy:
Walmsley, I. A.
Waxer, L.
Iaconis, C.
Powiązania:
https://bibliotekanauki.pl/articles/1968531.pdf
Data publikacji:
1998-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Bz
42.50.Vk
33.80.-b
42.50.Dv
Opis:
Wave fields play a central role in both classical and quantum mechanics. Generally applicable methods for the characterization of (scalar) fields are outlined, and illustrated by experiment and simulation.
Źródło:
Acta Physica Polonica A; 1998, 93, 1; 159-178
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanometer-Scale Incoherent Imaging Using Laser-Plasma EUV Source
Autorzy:
Wachulak, P.
Bartnik, A.
Fiedorowicz, H.
Kostecki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1490098.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.38.Ph
52.50.Dg
41.50.+h
42.30.Va
42.79.Ci
Opis:
Various imaging methods and techniques capable of reaching a nanometer spatial resolution are currently under development. One of them is an extreme ultraviolet microscopy, based on the Fresnel zone plates. In this paper a compact, high-repetition, laser-plasma EUV source, with a gas puff target, capable of emitting quasi-monochromatic radiation at 13.8 nm wavelength was used in the first demonstration of a desk-top EUV transmission microscopy with a spatial (half-pitch) resolution of 50 nm. EUV microscopy images of objects with various thicknesses and the spatial resolution measurements using the knife-edge test are presented.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 450-453
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Confined Metamaterial Structures Based on Coordinate Transformations
Autorzy:
Vasić, B.
Gajić, R.
Isić, G.
Hingerl, K.
Powiązania:
https://bibliotekanauki.pl/articles/1807844.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.50.De
41.20.Jb
42.70.-a
Opis:
We apply transformation optics to structures in which the electromagnetic field is confined by highly conducting coatings. The possibility of changing the field propagation direction without perturbation is demonstrated on the example of a waveguide bend. Using this approach it is also possible to reshape a confined structure in order to meet certain external requirements and to redistribute a field in order to obtain desired field distribution. The structure implementation implies replacing a part of given confined structure with a metamaterial designed using the technique of transformation optics. Simplification of structure realization based on using reduced set of material parameters is examined. Our theoretical considerations are confirmed by full wave finite element simulations of a waveguide bend.
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 96-98
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Undulator-Like Radiation and Cooperative Phenomenon in Semiconductor Microstructure with Grating
Autorzy:
Tralle, I.
Zięba, P.
Powiązania:
https://bibliotekanauki.pl/articles/1490209.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.60.-m
42.50.Gy
73.61.Ey
73.40.kp
73.50.Fq
Opis:
In the article the cooperative $N^2$-effect is considered, that is the radiation whose power is ım $N^2$, where N is the number of emitters which in this case is equal to the number of electrons in a bunch. The suggested effect is the result of combining two other effects, Gunn-effect in GaAs and undulator-like radiation which can be produced by means of microstructure with grating (microundulator). It is very probable that the effect can be used for the developing of a new semiconductor-based room temperature source of the THz radiation.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 522-526
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Undulator-Like Radiation and N² Effects in Semiconductor Microstructures with Grating
Autorzy:
Tralle, I.
Zięba, P.
Powiązania:
https://bibliotekanauki.pl/articles/1402586.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.60.-m
42.50.Gy
73.61.Ey
73.40.kp
73.50.Fq
Opis:
In the article the cooperative N²-effects are considered, that is the radiation whose power is ım N², where N is the number of emitters which in this case is equal to the number of electrons in a bunch. The suggested effects are the result of combining two effects: the Gunn-effect in GaAs and undulator-like radiation, or "pumping wave" acting on the electrons and which is the result of undulator field, while the second is the backward effect of radiation which is produced by electrons moving within such microundulator. It is very probable that the effects can be used for the developing of a new semiconductor-based room temperature source of the THz-radiation.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 228-230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 143

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