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Family of Zeilinger-Horne-Greenberger "W" states lead to stronger nonclassicality than family of Greenberger-Horne-Zeilinger "GHZ" states
Aditi Sen De, Ujjwal Sen, Marcin Wiesniak +2
The N-qubit states of the W class, for N>10, lead to more robust (against noise admixture) violations of local realism, than the GHZ states. These violations are most pronounced fo…
Violation of Bell's inequality: criterion for quantum communication complexity advantage
Caslav Brukner, Marek Zukowski, Jian-Wei Pan +1
We prove that for every Bell's inequality and for a broad class of protocols, there always exists a multi-party communication complexity problem, for which the protocol assisted by…
Security of Quantum Key Distribution with Entangled Qutrits
Thomas Durt, Nicolas J. Cerf, Nicolas Gisin +1
The study of quantum cryptography and quantum non-locality have traditionnally been based on two-level quantum systems (qubits). In this paper we consider a generalisation of Ekert…
Functional Bell inequalities can serve as a stronger entanglement witness
Aditi Sen De, Ujjwal Sen, Marek Zukowski
We consider a Bell inequality for a continuous range of settings of the apparatus at each site. This "functional" Bell inequality gives a better range of violation for generalized…
Quantum communication complexity protocol with two entangled qutrits
Caslav Brukner, Marek Zukowski, Anton Zeilinger
We formulate a two-party communication complexity problem and present its quantum solution that exploits the entanglement between two qutrits. We prove that for a broad class of pr…
Going beyond GHZ paradox
Dagomir Kaszlikowski, Darwin Gosal, E. J. Ling +3
We present numerical data showing, that three qutrit correlations for a pure state, which is not maximally entangled, violate local realism more strongly than three-qubit correlati…