3 research outputs found
Multipartite entanglement percolation
We present percolation strategies based on multipartite measurements to
propagate entanglement in quantum networks. We consider networks spanned on
regular lattices whose bonds correspond to pure but non-maximally entangled
pairs of qubits, with any quantum operation allowed at the nodes. Despite
significant effort in the past, improvements over naive (classical) percolation
strategies have been found for only few lattices, often with restrictions on
the initial amount of entanglement in the bonds. In contrast, multipartite
entanglement percolation outperform the classical percolation protocols, as
well as all previously known quantum ones, over the entire range of initial
entanglement and for every lattice that we considered.Comment: revtex4, 4 page
Entanglement Percolation with Bipartite Mixed States
We develop a concept of entanglement percolation for long-distance singlet
generation in quantum networks with neighboring nodes connected by partially
entangled bipartite mixed states. We give a necessary and sufficient condition
on the class of mixed network states for the generation of singlets. States
beyond this class are insufficient for entanglement percolation. We find that
neighboring nodes are required to be connected by multiple partially entangled
states and devise a rich variety of distillation protocols for the conversion
of these states into singlets. These distillation protocols are suitable for a
variety of network geometries and have a sufficiently high success probability
even for significantly impure states. In addition to this, we discuss possible
further improvements achievable by using quantum strategies including
generalized forms of entanglement swapping.Comment: 6+ pages, 5 figures; Published versio
Distribution of entanglement in large-scale quantum networks
10.1088/0034-4885/76/9/096001Reports on Progress in Physics769-RPPH