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    Wyświetlanie 1-4 z 4
    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:
    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:
    Quantum States and Number-Phase Uncertainty Relations Measured by Optical Homodyne Tomography
    Autorzy:
    Raymer, M. G.
    Smithey, D. T.
    Beck, M.
    Cooper, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931411.pdf
    Data publikacji:
    1994-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Bz
    42.50.Wm
    Opis:
    Experiments have been performed to determine the Wigner distribution and the density matrix (and for pure states the wave function) of a light mode, by using tomographic inversion of a set of measured probability distributions for quadrature amplitudes. From these measurements the quantum distributions of optical phase and photon number have been obtained. The measurements of quadrature-amplitude distributions for a temporal mode of the electromagnetic field are carried out using balanced homodyne detection. We refer to this new method as optical homodyne tomography. Given the measured density matrix, one can experimentally infer any of the various quantum distributions of optical phase, in particular the Pegg-Barnett (or, equivalently, Shapiro-Shepard) phase distribution, the marginal Wigner distribution, and the Vogel-Schleich operational phase distribution. We have used this approach to make measurements of the number-phase uncertainty relation for coherent-state fields. The coherent states do not attain the minimum value for the number-phase uncertainty product, as set by the expectation value of the commutator of the number and phase operators; this is true theoretically and experimentally.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 1; 71-80
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Realistic Measurement of Phase
    Autorzy:
    Paul, H.
    Leonhardt, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931520.pdf
    Data publikacji:
    1994-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Bz
    42.50.Wm
    Opis:
    The experimental schemes for measuring quantum-mechanical phase properties of light suggested and partly also realized thus far, namely (i) amplification, with the help of a quantum amplifier, of the microscopic field before phase measurement, (ii) heterodyning the field with a strong local oscillator, and (iii) performing two separate homodyne measurements on the field after beam splitting, are compared from a theoretical point of view. They share the common feature that undesired noise enters the experimental setup, which makes the measurement fuzzy. It will be pointed out that all three schemes amount to measuring the Q function of the original field, and hence are fully equivalent. Since the Q function can be interpreted as a smoothed Wigner function, one may associate with the introduced noise a smoothing process in which intrinsically quantum-mechanical features displayed by finer details of the Wigner function - especially by the occurrence of negative values - are lost. As a consequence, the measured phase distribution will be broader than the "true" one based on the concept of a quantum-mechanical phase operator. In realistic experiments, the nonunit detection efficiency further deteriorates the measuring results. It will be shown that also this effect can be properly described by an (additional) smoothing process leading to a certain s-parametrized quasiprobability distribution, with a parameter s that is connected with the detection efficiency in a simple way, as the distribution that is actually measurable.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 1; 213-223
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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