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21 papers · 1 filter
Light-Matter Quantum Interface
K. Hammerer, K. Molmer, E. S. Polzik +1
We propose a quantum interface which applies multiple passes of a pulse of light through an atomic sample with phase/polarization rotations in between the passes. Our proposal does…
Valence Bond Solids for Quantum Computation
F. Verstraete, J. I. Cirac
Cluster states are entangled multipartite states which enable to do universal quantum computation with local measurements only. We show that these states have a very simple interpr…
Multipartite Bound Information exists and can be activated
A. Acin, J. I. Cirac, Ll. Masanes
We prove the conjectured existence of Bound Information, a classical analog of bound entanglement, in the multipartite scenario. We give examples of tripartite probability distribu…
Entanglement and Frustration in Ordered Systems
M. M. Wolf, F. Verstraete, J. I. Cirac
This article reviews and extends recent results concerning entanglement and frustration in multipartite systems which have some symmetry with respect to the ordering of the particl…
Diverging Entanglement Length in Gapped Quantum Spin Systems
F. Verstraete, M. A. Martin-Delgado, J. I. Cirac
We prove the existence of gapped quantum Hamiltonians whose ground states exhibit an infinite entanglement length, as opposed to their finite correlation length. Using the concept…
Nonlocal resources in the presence of Superselection Rules
N. Schuch, F. Verstraete, J. I. Cirac
Superselection rules severely alter the possible operations that can be implemented on a distributed quantum system. Whereas the restriction to local operations imposed by a bipart…