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10 papers · 2 filters
Bell inequalities and entanglement at quantum phase transition in the XXZ Model
L. Justino, Thiago R. de Oliveira
Entanglement and violation of Bell inequalities are aspects of quantum nonlocality that have been often confused in the past. It is now known that this equivalence is only true for…
Bell inequalities with continuous angular variables
Carolina V. S. Borges, Perola Milman, Arne Keller
We consider bipartite quantum systems characterized by a continuous angular variable θ\in [-π, π[, representing, for instance, the position of a particle on a circle. We show how t…
Witnessing nonclassical multipartite states
A. Saguia, C. C. Rulli, Thiago R. de Oliveira +1
We investigate a witness for nonclassical multipartite states based on their disturbance under local measurements. The witness operator provides a sufficient condition for nonclass…
Cauchy-Schwarz characterization of tripartite quantum correlations in an optical parametric oscillator
K. Dechoum, W. S. Marques, A. Z. Khoury
We analyze the three-mode correlation properties of the electromagnetic field in a optical parametric oscillator below threshold. We employ a perturbative expansion of the Itô equa…
Semiclassical Wigner distribution for two-mode entangled state
K. Dechoum, M. D. Hahn, R. O. Vallejos +1
We derive the steady state solution of the Fokker-Planck equation that describes the dynamics of the nondegenerate optical parametric oscillator in the truncated Wigner representat…
Extending matchgates into universal quantum computation
Daniel J. Brod, Ernesto F. Galvão
Matchgates are a family of two-qubit gates associated with noninteracting fermions. They are classically simulatable if acting only on nearest neighbors, but become universal for q…