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SUMMARY:Theory of the quantum internet - Koji Azuma\, NTT Tokyo
DTSTART:20161104T120000Z
DTEND:20161104T130000Z
UID:TALK68409@talks.cam.ac.uk
CONTACT:Steve Brierley
DESCRIPTION:The quantum internet holds promise for accomplishing quantum t
 eleportation and unconditionally secure communication freely between arbit
 rary clients all over the globe\, as well as the simulation of quantum man
 y-body systems. For such a quantum internet protocol\, we present a genera
 l fundamental upper bound on the obtainable entanglement or secret key in 
 terms of the squashed entanglement of the channel [1]. We also consider it
 s converse problem. In particular\, we present a protocol [2] constructibl
 e from any given quantum network\, which is based on running quantum repea
 ters in parallel over the network. The optimality of this protocol is asso
 ciated with fundamental problems such as additivity questions for quantum 
 channels and questions on the existence of a gap between the quantum capac
 ity and the private capacity.\n\n[1] K. Azuma\, A. Mizutani\, and H.-K. Lo
 \, arXiv:1601.02933.\n[2] K. Azuma and G. Kato\, arXiv:1606.00135.
LOCATION:MR12\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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