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SUMMARY:All-photonic quantum networks - Koji Azuma\, NTT Basic Research La
 boratories
DTSTART:20170525T131500Z
DTEND:20170525T141500Z
UID:TALK72456@talks.cam.ac.uk
CONTACT:Steve Brierley
DESCRIPTION:Quantum communication holds promise for unconditionally secure
  transmission of secret messages and faithful transfer of unknown quantum 
 states. Quantum repeaters are necessary for extending the achievable dista
 nce of quantum communication towards the quantum internet. However\, all t
 he conventional paradigms required repeater nodes to be equipped with dema
 nding matter quantum memories. Here we show that this requirement is not n
 ecessary at all\, by presenting 'all-optical' quantum communication scheme
 s [1\,2]. In particular\, these schemes use only optical devices such as l
 inear optical elements\, single-photon sources\, photon detectors and acti
 ve feedforwards\, that is\, without any matter quantum memory. Nonetheless
 \, these schemes can work efficiently as intercity/intercontinental backbo
 ne quantum links for the quantum internet.\n\n[1] KA\, K. Tamaki and H.-K.
  Lo\, Nat. Commun. 6\, 6787 (2015).\n[2] KA\, K. Tamaki and W. J. Munro\, 
 Nat. Commun. 6\, 10171 (2015). 
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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