922 research outputs found
Solvable Potentials from Supersymmetric Quantum Mechanics
A recurrence relation of Riccati-type differential equations known in
supersymmetric quantum mechanics is investigated to find exactly solvable
potentials. Taking some simple {\it ans\"atze}, we find new classes of solvable
potentials as well as reproducing the known shape-invariant ones.Comment: 14 pages, Late
Bound entangled states with nonzero distillable key rate
In this paper, we present sufficient conditions for states to have positive
distillable key rate. Exploiting the conditions, we show that the bound
entangled states given by Horodecki et al. [Phys. Rev. Lett. 94, 160502 (2005),
quant-ph/0506203] have nonzero distillable key rate, and finally exhibit a new
class of bound entangled states with positive distillable key rate, but with
negative Devetak-Winter lower bound of distillable key rate for the ccq states
of their privacy squeezed versions.Comment: 7 pages, 1 figure, typos corrected, accepted for publication in PR
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