6533b828fe1ef96bd12884b2
RESEARCH PRODUCT
Surface entanglement in quantum spin networks
Salvatore Marco GiampaoloStefano ZippilliFabrizio Illuminatisubject
PhysicsQuantum PhysicsQuantum networkQuantum discordCondensed Matter - Mesoscale and Nanoscale PhysicsFOS: Physical sciencesMathematical Physics (math-ph)Quantum capacityQuantum entanglementQuantum PhysicsMultipartite entanglementAtomic and Molecular Physics and OpticsOpen quantum systemQuantum mechanicsMesoscale and Nanoscale Physics (cond-mat.mes-hall)W stateQuantum Physics (quant-ph)Amplitude damping channelentanglementMathematical Physicsdescription
We study the ground-state entanglement in systems of spins forming the boundary of a quantum spin network in arbitrary geometries and dimensionality. We show that as long as they are weakly coupled to the bulk of the network, the surface spins are strongly entangled, even when distant and non directly interacting, thereby generalizing the phenomenon of long-distance entanglement occurring in quantum spin chains. Depending on the structure of the couplings between surface and bulk spins, we discuss in detail how the patterns of surface entanglement can range from multi-pair bipartite to fully multipartite. In the context of quantum information and communication, these results find immediate application to the implementation of quantum routers, that is devices able to distribute quantum correlations on demand among multiple network nodes.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-02-05 |