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    Wyświetlanie 1-14 z 14
    Tytuł:
    Propagation of Double Resonance and Dark Area
    Autorzy:
    Eberly, J. H.
    Kozlov, V. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030482.pdf
    Data publikacji:
    2002-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.-p
    42.50.Dv
    42.50.Lc
    42.50.Gy
    Opis:
    We report new results in propagation of two coherently coupled optical pulses in an inhomogeneously broadened three-level lambda medium.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 3; 459-462
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Wave Function of the Photon
    Autorzy:
    Białynicki-Birula, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931426.pdf
    Data publikacji:
    1994-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.-p
    Opis:
    It is shown that the wave function of the photon is a very useful concept with interesting ramifications. It plays a major role in bridging the gap between classical theory of electromagnetism and quantum electrodynamics. The photon wave function can also be used to construct a phase-space distribution for the photon (Wigner function) that describes the transport of radiation.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 1; 97-116
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of the Spontaneous Emission of Dye Molecules in Photonic Crystals
    Autorzy:
    Petrov, E.
    Bogomolov, V.
    Kalosha, I.
    Gaponenko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992744.pdf
    Data publikacji:
    1998-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.-p
    Opis:
    Modification of the spontaneous emission of dye molecules embedded in artificial opals exhibiting stop bands in the visible range is observed. Molecules embedded in artificial opals show dips in spontaneous emission spectra and modified fluorescence decay kinetics. Results are interpreted in terms of redistribution of the photon density of states. Effects of the multiple reabsorption and reemission of fluorescence photons and interaction of dye molecules with the silica surface are discussed.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 5-6; 761-771
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Open Quantum Systems
    Autorzy:
    Japha, Y.
    Kofman, A. G.
    Kurizki, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968526.pdf
    Data publikacji:
    1998-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Lc
    03.65.Bz
    03.75.Be
    42.50.-p
    Opis:
    Spontaneous decay of excited cold atoms into a cavity can drastically affect their translational dynamics, namely, atomic reflection, transmission and localization at the interface. We show that the quantum Zeno effect on excitation decay of an atom is observable in open cavities and waveguides, using a sequence of evolution-interrupting pulses on a nanosecond scale.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 1; 135-145
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Violation of Bell-CHSH & CH Inequalities by Superposition of Two Coherent States (π/2 Out of Phase)
    Autorzy:
    Kumar Mishra, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400190.pdf
    Data publikacji:
    2013-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Ud
    03.67.Mn
    42.50.Dv
    42.50.-p
    Opis:
    We study the tests of the Bell-CHSH & CH inequalities by superposition of two coherent states (ı/2 out of phase), a class of non-Gaussian state, using photon parity and on/off measurements. Large violations of the Bell-type inequalities have been observed theoretically confirming the interpretation and validity of quantum mechanics against the local-realistic theories.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 1; 21-24
    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:
    Long-Distance Quantum Communication
    Autorzy:
    Duan, L.
    Lukin, M.
    Cirac, J. I.
    Zoller, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030464.pdf
    Data publikacji:
    2002-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.67.-a
    42.50.-p
    Opis:
    We show how one can use atomic ensembles in order to construct quantum repeaters. This may allow for quantum communication over arbitrarily long distances.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 3; 325-336
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Open-Loop Control for Focusing of Neutral Particles by Modulated Optical Field
    Autorzy:
    Borisenok, S.
    Iqbal, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812039.pdf
    Data publikacji:
    2008-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.-p
    02.30.Yy
    Opis:
    We propose open-loop control model of focusing cooled quantum particles in 1D and 2D modulated optical field. Applying Kapitza's procedure of averaging, we demonstrate that the type of attractor in the fixed points can be controlled by changing the parameters of control optical field. We support our conclusions by simulation for harmonic control.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 4; 751-759
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling the Dynamic Emission of a Polarized $Cr^{4+}:YAG$ Crystal Investigated by Double-Pulse Pumping Generated by a Nd-Laser
    Autorzy:
    Ghani, B.
    Hammadi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808015.pdf
    Data publikacji:
    2009-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Rz
    42.50.-p
    Opis:
    A mathematical model describing the dynamic emission of intracavity polarized isotropic $Cr^{4+}:YAG$ solid-state saturable absorber was developed. This model considers double pumping laser pulses to simulate the actions of $Cr^{4+}:YAG$ as a dual Q-switched crystal (1.06 μm) and lasing medium (1.4 μm). The model describes the time evolution of interaction between the pumping laser pulse, partial polarizer and the polarized saturable absorber. The analysis of the polarization process is based on the assumption that at each moment of lasing evolution, the state of polarization represented by an eigenstate corresponds to the lowest radiation losses state. The model offers a simple mechanism for studying the kinetics of the pulsed lasers and the influence of the variations of the pumping laser power and nonlinear anisotropy parameter on the characteristics of the output laser pulses 1.06 μm and 1.4 μm. The angular rotation of the passive switch $Cr^{4+}:YAG$ reveals that the transmission of the polarized 1.06 μm laser radiation is strongly anisotropic in the saturation regime. The suggested model estimates the transmission of pumping laser density of the polarized light 1.06 μm radiation as a function of nonlinear anisotropy parameter, temporal behavior of the relative population inversion of Nd-laser, population inversion of the different polarized levels of $Cr^{4+}:YAG$ pulsed laser and the output laser pulse densities under impact of different values of the nonlinear anisotropy which is due to the self-induced anisotropy of its saturated absorption.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 5; 873-879
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-Electrode Tapered Waveguide Structure for Quantum-Dot Semiconductor Optical Amplifiers
    Autorzy:
    Abedi, K.
    Mohadesrad, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399959.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.-p
    42.30.Lr
    42.79.-e
    Opis:
    In this paper, by employing two practical methods of multi-electrode design and tapered waveguide structure, compensation techniques to restore declining carrier density along the quantum dot semiconductor optical amplifier's waveguide are investigated. In the multi-electrode method, the effects of distributing current via electrodes on the gain and the cross-gain modulation for two, three and four-electrode structures are studied. These characteristics are also investigated for the quantum dot semiconductor optical amplifiers with a tapered waveguide structure for the first time, including waveguides with different profiles and width ratios. After due comparison between these two methods, optimum parameters of the two techniques will be used simultaneously along each other to form a combined method. Through these design developments, gain as the main feature of the quantum dot semiconductor optical amplifiers continuously increases, though cross-gain modulator results show that there is a trade-off between the modulation efficiency and improving structure capability of restoring carrier density.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 411-414
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Entanglement of a Gas of Atomic Spins
    Autorzy:
    Bigelow, N. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030479.pdf
    Data publikacji:
    2002-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.-b
    42.50.-p
    32.80.-t
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 3; 449-457
    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:
    Absorption and Photoluminescence of ZnSe/Zn$\text{}_{x}$Cd$\text{}_{1-x}$Se Superlattices and Quantum Wells under Hydrostatic Pressure
    Autorzy:
    Griebl, E.
    Kerner, W.
    Haserer, B.
    Reisinger, T.
    Hahn, B.
    Gebhardt, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952528.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.50.+p
    68.65.+g
    42.50.-p
    Opis:
    We present absorption measurements of a pseudomorphic Zn$\text{}_{0.75}$Cd$\text{}_{0.25}$Se/ZnSe superlattice and a Zn$\text{}_{0.91}$Cd$\text{}_{0.09}$ Se/ZnSe single quantum well under high hydrostatic pressure applied by a diamond anvil cell. Excitonic transitions as 1s-heavy hole and 1s-light hole between the first bound states or minibands as well as transitions in the buffer material are visible. Transition energies are well understood by calculations of the band structure near Γ. The observed energy distance between photoluminescence and hh-absorption signal gives information on exciton localization. Whereas this distance is nearly pressure independent in the buffer, there is a significant increase at pressures P > 5 GPa for quantum structures.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 1017-1021
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Entanglement conditions involving intensity correlations of optical fields: the case of multi-port interferometry
    Autorzy:
    Ryu, J.
    Marciniak, M.
    Wieśniak, M.
    Kaszlikowski, D.
    Żukowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1052945.pdf
    Data publikacji:
    2017-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Ud
    42.50.-p
    03.67.Bg
    03.67.Mn
    Opis:
    Normalized quantum Stokes operators introduced in Phys. Rev. A 95, 042113 (2017) enable one to better observe non-classical correlations of entangled states of optical fields with undefined photon numbers. For a given run of an experiment the new quantum Stokes operators are defined by the differences of the measured intensities (or photon numbers) at the exits of a polarizer divided by their sum. It is this ratio that is to be averaged, and not the numerator and the denominator separately, as it is in the conventional approach. The new approach allows to construct more robust entanglement indicators against photon-loss noise, which can detect entangled optical states in situations in which witnesses using standard Stokes operators fail. Here we show an extension of this approach beyond phenomena linked with polarization. We discuss EPR-like experiments involving correlations produced by optical beams in a multi-mode bright squeezed vacuum state. EPR-inspired entanglement conditions for all prime numbers of modes are presented. The conditions are much more resistant to noise due to photon loss than similar ones which employ standard Glauber-like intensity, correlations.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 6; 1713-1718
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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