382 research outputs found
High-visibility multi-photon interference of Hanbury Brown - Twiss type for classical light
Difference-phase (or Hanbury Brown - Twiss type) intensity interference of
classical light is considered in higher orders in the intensity. It is shown
that, while the visibility of sum-phase (NOON-type) interference for classical
sources drops with the order of interference, the visibility of
difference-phase interference has opposite behavior. For three-photon and
four-photon interference of two coherent sources, the visibility can be as high
as 81.8% and 94.4%, respectively. High-visibility three-photon and four-photon
interference of space-time and polarization types has been observed in
experiment, for both coherent and pseudo-thermal light.Comment: 11 pages, 9 figure
Localization of one-photon state in space and Einstein-Podolsky-Rosen paradox in spontaneous parametric down conversion
An experiment on one-photon state localization in space using a correlation technique in Spontaneous Parametric Down Conversion (SPDC) process is discussed. Results of measurements demonstrate an idea of the Einstein-Podolsky-Rosen (EPR) paradox for coordinate and momentum variables of photon states. Results of the experiment can be explained with the help of an advanced wave technique. The experiment is based on the idea that two-photon states of optical electromagnetic fields arising in the nonlinear process of the spontaneous parametric down conversion (spontaneous parametric light scattering) can be explained by quantum mechanical theory with the help of a single wave function
Nondestructive measurement of intensity of optical fields using spontaneous parametric down conversion
Results of nondestructive measurements of intensity (photons per mode) of light from different sources are discussed. The procedure of measurement does not destroy the state of the optical field. The method is based on using the second order nonlinearity of crystal media lacking a center of symmetry and the nonclassical properties of the process of Spontaneous Parametric Down Conversion (SPDC)
Plasma-Like Negative Capacitance in Nano-Colloids
A negative capacitance has been observed in a nano-colloid between 0.1 and
10^-5 Hz. The response is linear over a broad range of conditions. The
low-omega dispersions of both the resistance and capacitance are consistent
with the free-carrier plasma model, while the transient behavior demonstrates
an unusual energy storage mechanism. A collective excitation, therefore, is
suggested.Comment: 3 pages, 3 figure
Heavy-quarkonium creation and annihilation with O(alpha_s^3 ln(alpha_s)) accuracy
We calculate the O(alpha_s^3 ln(alpha_s)) contributions to the
heavy-quarkonium production and annihilation rates. Our result sheds new light
on the structure of the high-order perturbative corrections and opens a new
perspective for a high-precision theoretical analysis. We also determine the
three-loop anomalous dimensions of the nonrelativistic vector and pseudoscalar
currents.Comment: 10 pages (Latex). Eq. (6) corrected, conclusions unchange
Bottom quark mass from Upsilon sum rules to O (alpha(3)(s))
We use the O(α3s) approximation of the heavy-quark vacuum polarization function in the threshold region to determine the bottom quark mass from nonrelativistic Υ sum rules. We find very good stability and convergence of the perturbative series for the bottom quark mass in MS¯¯¯¯¯ renormalization scheme. Our final result is m¯¯¯b(m¯¯¯b)=4.169±0.008th±0.002αs±0.002exp
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