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18 papers · 2 filters
Topological order in 1D Cluster state protected by symmetry
Wonmin Son, Luigi Amico, Vlatko Vedral
We demonstrate how to construct the Z2*Z2 global symmetry which protects the ground state degeneracy of cluster states for open boundary conditions. Such a degeneracy ultimately ar…
The classical-quantum boundary for correlations: discord and related measures
Kavan Modi, Aharon Brodutch, Hugo Cable +2
One of the best signatures of nonclassicality in a quantum system is the existence of correlations that have no classical counterpart. Different methods for quantifying the quantum…
Classical to quantum in large number limit
Kavan Modi, Rosario Fazio, Saverio Pascazio +2
We construct a quantumness witness following the work of Alicki and van Ryn (AvR) in "A simple test of quantumness for a single system" [J. Phys. A: Math. Theor., vol. 41, 062001 (…
Spin quantum correlations of relativistic particles
Pablo L. Saldanha, Vlatko Vedral
We show that a pair of massive relativistic spin-1/2 particles prepared in a maximally entangled spin state in general is not capable of maximally violating the Clauser-Horne-Shimo…
Physical interpretation of the Wigner rotations and its implications for relativistic quantum information
Pablo L. Saldanha, Vlatko Vedral
We present a new treatment for the spin of a massive relativistic particle in the context of quantum information based on a physical interpretation of the Wigner rotations, obtaini…
Quantum phases with differing computational power
Jian Cui, Mile Gu, Leong Chuan Kwek +3
The observation that concepts from quantum information has generated many alternative indicators of quantum phase transitions hints that quantum phase transitions possess operation…