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- University of GdańskPL161 papers
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9 papers · 2 filters
Solution of the momentum-space Schrödinger equation for bound states of the N-dimensional Coulomb problem (revisited)
Radosław Szmytkowski
The Schrödinger-Coulomb Sturmian problem in , , is considered in the momentum representation. An integral formula for the Gegenbauer polynomials, found…
No-broadcasting of non-signalling boxes via operations which transform local boxes into local ones
P. Joshi, A. Grudka, K. Horodecki +3
We deal with families of probability distributions satisfying non-signalling condition, called non-signalling boxes and consider class of operations that transform local boxes into…
Schemes of transmission of classical information via quantum channels with many senders: discrete and continuous variables cases
L. Czekaj, J. K. Korbicz, R. W. Chhajlany +1
Superadditivity effects in the classical capacity of discrete multi-access channels (MACs) and continuous variable (CV) Gaussian MACs are analysed. New examples of the manifestatio…
Quantum privacy witness
Konrad Banaszek, Karol Horodecki, Paweł Horodecki
While it is usually known that the mean value of a single observable is enough to detect entanglement or its distillability, the counterpart of such an approach in the case of quat…
Convergence to equilibrium under a random Hamiltonian
Fernando G. S. L. Brandão, Piotr Ćwikliński, Michał Horodecki +3
We analyze equilibration times of subsystems of a larger system under a random total Hamiltonian, in which the basis of the Hamiltonian is drawn from the Haar measure. We obtain th…
Directed percolation effects emerging from superadditivity of quantum networks
L. Czekaj, R. W. Chhajlany, P. Horodecki
Entanglement indcued non--additivity of classical communication capacity in networks consisting of quantum channels is considered. Communication lattices consisiting of butterfly-t…