4,360 research outputs found
Superheavies: Theoretical incitements and predictions
It is well known that in fusion reactions one may get only neutron deficient
superheavy nuclei located far from the island of stability. The multi-nucleon
transfer reactions allow one to produce more neutron enriched new heavy nuclei
but the corresponding cross sections are rather low. Neutron capture process is
considered here as alternative method for production of long-lived neutron rich
superheavy nuclei. Strong neutron fluxes might be provided by nuclear reactors
and nuclear explosions in laboratory frame and by supernova explosions in
nature. All these cases are discussed in the paper.Comment: 7 FIGURE
Extending Hudson's theorem to mixed quantum states
According to Hudson's theorem, any pure quantum state with a positive Wigner
function is necessarily a Gaussian state. Here, we make a step towards the
extension of this theorem to mixed quantum states by finding upper and lower
bounds on the degree of non-Gaussianity of states with positive Wigner
functions. The bounds are expressed in the form of parametric functions
relating the degree of non-Gaussianity of a state, its purity, and the purity
of the Gaussian state characterized by the same covariance matrix. Although our
bounds are not tight, they permit us to visualize the set of states with
positive Wigner functions.Comment: 4 pages, 2 figure
Photon losses depending on polarization mixedness
We introduce a quantum channel describing photon losses depending on the
degree of polarization mixedness. This can be regarded as a model of quantum
channel with correlated errors between discrete and continuous degrees of
freedom. We consider classical information over a continuous alphabet encoded
on weak coherent states as well as classical information over a discrete
alphabet encoded on single photons using dual rail representation. In both
cases we study the one-shot capacity of the channel and its behaviour in terms
of correlation between losses and polarization mixedness
Стратегія економічного та соціального розвитку Одеської області до 2020 року
-Сценарій розвитку, що передбачає реалізацію «Стратегії економічного та соціального розвитку Одеської області до 2020 року», базується на ефективному викорситанні потенціалу регіону.
Scenario development, which involves implementation of "Strategy of economic and social development of the Odessa region by 2020," based on an effective vykorsytanni potential.
- …