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- University of GdańskPL15 papers
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5 papers · 1 filter
Extending Bell inequalities to more parties
Yu-Chun Wu, Piotr Badziag, Marcin Wieśniak +1
We describe a method of extending Bell inequalities from to parties and formulate sufficient conditions for our method to produce tight inequalities from tight inequaliti…
No-local-broadcasting theorem for quantum correlations
Marco Piani, Pawel Horodecki, Ryszard Horodecki
We prove that the correlations present in a multipartite quantum state have an \emph{operational} quantum character as soon as the state does not simply encode a multipartite class…
Nonmaximally entangled states can be better for multiple linear optical teleportation
Joanna Modlawska, Andrzej Grudka
We investigate multiple linear optical teleportation in the Knill-Laflamme-Milburn scheme with both maximally and nonmaximally entangled states. We show that if the qubit is telepo…
Entanglement-swapping boxes and their communication properties
Andrzej Grudka, Michal Horodecki, Pawel Horodecki +2
We pose the fundamental question of communication properties of primitives irrespectively of their implementation. To illustrate the idea we introduce the concept of entanglement-s…
Unconditional privacy over channels which cannot convey quantum information
Karol Horodecki, Michal Horodecki, Pawel Horodecki +2
By sending systems in specially prepared quantum states, two parties can communicate without an eavesdropper being able to listen. The technique, called quantum cryptography, enabl…