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Wyszukujesz frazę "Tomaszewski, J.J." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Entanglement Detection by Current Measurements in Double Quantum Dot System
    Autorzy:
    Busz, P.
    Rożek, P.
    Tomaszewski, D.
    Martinek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386781.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.67.Mn
    03.67.Bg
    73.23.-b
    Opis:
    The development of quantum computing in quantum dots systems requires highly efficient and continuous solid-state source of spatially separated spin-entangled electrons. One of the approaches is a use of double quantum dot system connected to superconducting lead, where Cooper pairs provide a source of naturally entangled electrons. Apart from the source, an useful tool for detection of quantum entanglement is needed. We present entanglement detection by the ferromagnetic electrodes using entanglement witness operator method and direct measurement of spin polarized current in the system. We investigate requirements that have to be fulfilled by ferromagnetic detectors.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 490-492
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Specific Heat of (NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$)$\text{}_{3}$Bi$\text{}_{2}$I$\text{}_{9}$
    Autorzy:
    Plackowski, T.
    Włosewicz, D.
    Tomaszewski, P. E.
    Baran, J.
    Marchewka, M. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932127.pdf
    Data publikacji:
    1995-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    65.40.-f
    Opis:
    The specific heat of title compound was measured by adiabatic calorimeter in the temperature range 80-315 K. The phase transitions at about 304, 285 and 235 K were confirmed. A new structural phase transition at about 125 K was observed as well as new anomaly on differential scanning calorimetry (DSC) curve at about 318 K. The peculiar multiple character of C, anomalies may be explained in terms of phase transitions or intermediate phases induced by impurities. The specific heat data are in agreement with the independent DSC measurements and with preliminary X-ray studies.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 3; 635-641
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Terahertz Photovoltaic Response of Si-MOSFETs: Spin Related Effect
    Autorzy:
    Videlier, H.
    Dyakonova, N.
    Teppe, F.
    Consejo, C.
    Chenaud, B.
    Knap, W.
    Lusakowski, J.
    Tomaszewski, D.
    Marczewski, J.
    Grabiec, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492958.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.Tv
    Opis:
    We report on investigations of photovoltaic response of Si-MOSFETs subjected to terahertz radiation in high magnetic fields. Then a DC drain-to-source voltage is developed that shows singularities in magnetic fields corresponding to paramagnetic resonance conditions. These singularities are investigated as a function of incident frequency, temperature and two-dimensional carrier density. We tentatively attribute these resonances to spin transitions of the electrons bound to Si dopants and discuss the possible physical mechanism of the photovoltaic signal generation.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 927-929
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Influence of Silicon Substrate Parameters on a Responsivity of MOSFET-Based Terahertz Detectors
    Autorzy:
    Kucharski, K.
    Zagrajek, P.
    Tomaszewski, D.
    Panas, A.
    Głuszko, G.
    Marczewski, J.
    Kopyt, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1186027.pdf
    Data publikacji:
    2016-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.Tv
    85.60.Gz
    42.79.Pw
    Opis:
    Silicon n-channel MOS transistors are a promising solution for sub-terahertz radiation detection. Their sensitivity is strongly related to the device construction. A type and thickness of the device substrate are key parameters affecting the responsivity, because the silicon substrate is a medium for the radiation propagation and the radiation energy loss, which degrades the detection efficiency. This work is aimed at analysis of the silicon substrate characteristics effect on operation of the MOSFETs as the terahertz radiation sensors. A manufacturing of the MOSFETs on three different substrate types including changing the substrate thickness is described in the paper. Next, the fabricated devices were exposed to THz radiation and their photoresponses were measured. It may be concluded that MOSFETs on silicon-on-insulator wafers with locally thinned substrates demonstrate the highest photoresponse. However, the experiments with the MOSFETs on high resisivity wafers give also promising results.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 5; 1193-1195
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Entanglement Detection with Non-Ideal Ferromagnetic Detectors
    Autorzy:
    Rożek, P.
    Busz, P.
    Kłobus, W.
    Tomaszewski, D.
    Grudka, A.
    Baumgartner, A.
    Schönenberger, C.
    Martinek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386794.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.67.Mn
    03.67.Bg
    73.23.-b
    Opis:
    Entangled states are essential in basics quantum communication protocols and quantum cryptography. Ferromagnetic contacts can work as a spin detector, giving possibility of converting information about electron spin to the electric charge, and therefore, detection of entangled states with the electric current measurements is possible. Method of confirming entanglement with non-ideal detectors is presented, the impact of decoherence and noise on states and quality of entanglement is discussed. Entanglement witness (EW) operator method is compared with the CHSH inequalities approach. Required spin polarization for the EW is lower than for the CHSH inequalities. System with asymmetric spin polarizations of detectors was analyzed, including the CHSH inequalities and the EW method.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 493-495
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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