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    Wyświetlanie 1-13 z 13
    Tytuł:
    Collisional Line Shapes in the Presence of Broad-Band Squeezed Vacuum
    Autorzy:
    Cong, N. H.
    Vinh, L. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025783.pdf
    Data publikacji:
    2001-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Lc
    42.50.Ct
    Opis:
    In this paper we discuss the line shapes of a two-level atom in the presence of broad-band squeezed vacuum and collisional broadening. We describe the collisions and the squeezed vacuum using a stochastic model of Rabi amplitude fluctuations. From such a stochastic description the fast and the slow damping rates of the Bloch polarizations are obtained. The strong field resonance fluorescence spectrum in the presence of stochastic broad-band squeezed vacuum and collisions is derived.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 5; 545-555
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Noise Characteristics of Nonlinear Optical Amplifiers
    Autorzy:
    Boyd, R. W.
    Agarwal, G. S.
    Davis, W. V.
    Gaeta, A. L.
    Nagasako, E. M.
    Kauranen, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931479.pdf
    Data publikacji:
    1994-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    42.50.Lc
    Opis:
    Quantum mechanical arguments show that any optical amplifier must add noise to the amplified beam of light. For the case of a high gain amplifier with a coherent (Poissonian) input, the signal-to-noise ratio of the amplified beam must be at least two times smaller than that of the incident beam. We review the theoretical basis of this prediction. We also describe the results of our experimental investigations of the noise properties of optical amplifiers that utilize the nonlinear optical response of strongly driven atomic transitions.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 1; 117-126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Instabilities and Decoherence Problem
    Autorzy:
    Kilin, S. Ya.
    Horoshko, D. B.
    Shatokhin, V. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968521.pdf
    Data publikacji:
    1998-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Lc
    03.65.Bz
    Opis:
    A decoherence problem is discussed by means of quantum continuous measurement theory. It is shown that the conditional state of quantum system interacting with a bath preserves its initial purity. In this presentation decoherence arises as a result of averaging over the stochastic times of reduction moments ("clicks"). A method based on external phase feedback is proposed to slow down the decoherence of field superposition state in an open optical cavity. It is also shown that an atom placed inside the optical cavity plays a role of internal self-organized positive feedback between field and atom, which leads to an exponential increase in the mean dipole moment of the atom for the field initially prepared in a superposition of coherent states, i.e. to quantum instability.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 1; 97-104
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chaos via Period-Doubling Oscillations in an Exciton-Carrier-Photon System Driven by Optical Pumping
    Autorzy:
    Nguyen, Ba An
    Powiązania:
    https://bibliotekanauki.pl/articles/1930622.pdf
    Data publikacji:
    1994-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    71.35.+z
    42.50.Lc
    Opis:
    A detailed stability analysis is performed for a highly excited semiconductor modelled as an exciton-electron-hole-photon system driven externally by optical pumping. Chaotic self-pulsations are shown to occur on both the upper and lower branches of the bistable steady state curve of the system via a sequence of period-doubling oscillation process. Such a route to chaos is well known in laser physics and in other nonlinear systems but not in highly excited semiconductors yet.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 3; 541-552
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Shot Noise in Avalanche Photodiodes
    Autorzy:
    Kocak, F.
    Kilic, A.
    Tapan, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398762.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Lc
    29.40.Wk
    02.70.Uu
    Opis:
    PbWO₄ crystal-Hamamatsu S8148 avalanche photodiode (APD) assembly has been used in the barrel section of the CMS electromagnetic calorimeter. The shot noise of the photodiode is one of the important parameters for the energy resolution of the crystal-APD system. The major source of this noise is the statistical variations in the rate at which primary charge carriers are generated and recombine. Thus, the shot noise varies with position of the primary charge carriers generated in photodiode. In this work, the shot noise properties of the Hamamatsu S8148 APD structure and zinc sulfide-silicon (ZnS-Si) isotype heterojunction APD structure have been compared for the PbWO₄ photons. Calculations were made with a Single Particle Monte Carlo simulation technique.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 721-723
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    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:
    Entanglement in Open Quantum Systems
    Autorzy:
    Buchleitner, A.
    Carvalho, A. R. R.
    Mintert, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047819.pdf
    Data publikacji:
    2007-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.67.Mn
    03.65.Ud
    03.65.Yz
    42.50.Lc
    Opis:
    We give a compact review of some of our recent results on the quantification, the measurement, and the time evolution of entanglement in open quantum systems of variable structure and dimension. Also a first experimental implementation is briefly discussed.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 4; 575-588
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Cryptography with Macroscopic Photon-Number-Correlated Light
    Autorzy:
    Raymer, M. G.
    Funk, A. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030477.pdf
    Data publikacji:
    2002-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.67.Dd
    03.67.Hk
    42.50.Dv
    42.50.Lc
    Opis:
    We describe a new scheme for performing quantum key distribution. We present two physical implementations for the quantum key distribution system. The first implementation uses a type-II optical-parametric amplifier to generate the optical pulses which contain the key information. The second implementation uses correlated semiconductor emitters to generate the optical pulses.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 3; 437-448
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagonalization of a Bosonic Quadratic Form Using CCM: Application on a System with Two Interpenetrating Square Lattice Antiferromagnets
    Autorzy:
    Krüger, S. A.
    Schmalfuss, D.
    Richter, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013979.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ee
    75.30.Ds
    31.15.Dv
    42.50.Lc
    Opis:
    While the diagonalization of a quadratic bosonic form can always be done using a Bogolyubov transformation, the practical implementation for systems with a large number of different bosons is a tedious analytical task. Here we use the coupled cluster method to exactly diagonalise such complicated quadratic forms. This yields to a straightforward algorithm which can easily be implemented using computer algebra even for a large number of different bosons. We apply this method on a Heisenberg system with two interpenetrating square lattice antiferromagnets, which is a model for the quasi-2D antiferromagnet Ba$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{4}$Cl$\text{}_{2}$. Using a four-magnon spin wave approximation we get a complicated Hamiltonian with four different bosons, which is treated with coupled cluster method. Results are presented for magnetic ground state correlations.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 951-954
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Studies of Tunnel Magnetoresistance and Shot Noise in a Schottky-Barrier Carbon Nanotube Transistor with Ferromagnetic Contacts
    Autorzy:
    Krompiewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813866.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.75.Hh
    75.47.De
    42.50.Lc
    73.63.Fg
    Opis:
    A Schottky-barrier carbon nanotube field-effect transistor with ferromagnetic contacts was modelled. The theoretical method combines a tight-binding model and the non-equilibrium Green function technique. Tunnel magnetoresistance as well as current noise of the carbon nanotube field-effect transistor are the main issues addressed in this study. It is shown that the former may exceed 50%, whereas the latter is characterized by the Poissonian Fano factor (F) within the sub-threshold region, and the sub-Poissonian F≈0.5 for elevated gate voltages. Remarkably, reorientation of relative magnetization alignments of the contacts may lead to noticeable changes in the current noise.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 521-524
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-Frequency Lasers: from Excess Quantum Noise to RF Photonics Applications
    Autorzy:
    Alouini, M.
    Bretenaker, F.
    Brunel, M.
    Chauvat, D.
    Emile, O.
    Lai, N.
    Le Floch, A.
    Ropars, G.
    Vallet, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030275.pdf
    Data publikacji:
    2002-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Ah
    42.50.Ar
    42.50.Lc
    42.60.By
    42.60.Gd
    Opis:
    We illustrate the physics of two-frequency lasers by two examples. The first example illustrates the fundamental consequences of the existence of two eigenstates on the laser line width. We indeed show experimentally that the non-orthogonality of these two eigenstates results in an increase in the laser quantum noise. We also give a physical explanation of this vectorial excess noise factor. The second example illustrates the capabilities of two-frequency lasers in terms of applications. In the domain of RF frequency generation by optical means, we show how a pulsed two-frequency source can be built for lidar-radar applications and pulsed RF frequency generation.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 1; 7-20
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vacuum Fluctuations in Optical Metamaterials Containing Nonlinear Dielectrics
    Autorzy:
    Jakšić, Z.
    Ostojić, S.
    Tanasković, D.
    Matović, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795621.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Mf
    81.05.Xj
    42.50.Lc
    78.67.-n
    78.67.Pt
    Opis:
    We investigated the influence of zero-point fluctuations (vacuum fluctuations, optical quantum noise) to the optical response of electromagnetic metamaterials containing dielectrics with third-order Kerr-like nonlinearity. We determined the zero-point noise and calculated it for different analytes, including those used in forensic analysis and organic pollutants. The zero-point noise level is highest for shortest-wavelength plasmons and decreases towards long-range plasmons. It may be tailored through a convenient design of the metamaterial structure. Since noise spectral power is proportional to the nonlinearity of the analyte species present, we considered the possibility to use zero-point noise as an auxiliary tool for identification of targeted nonlinear samples. We believe that our investigation could be of importance in homeland defence, forensics, biomedicine, etc.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 628-630
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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