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SUMMARY:CQC Seminar: Joonwoo Bae - Joonwoo Bae
DTSTART:20070418T150000Z
DTEND:20070418T160000Z
UID:TALK7188@talks.cam.ac.uk
CONTACT:5635
DESCRIPTION:Title : Quantum Correlations vs. Classical Correlations\nMR14\
 , 4pm\n\nAbstract: In this talk\, we discuss equivalences and inequivalenc
 es\nbetween quantum and classical correlations.\n\nFirst\, we prove that s
 ecrecy can be established by sending non-secret\ncorrelations through a pr
 ivate channel\, deriving the classical analog of the\nquantum scenario\, t
 hat separable states can be used to distribute\ndistillable entanglement i
 n [PRL 91 037902 (2003)]. The derivation is based\non a conceptually natur
 al equivalence between quantum and classical\noperations.\n\nThen\, we cha
 racterize the cryptographic properties of quantum channels in\nthe realist
 ic scenario where the two honest parties employ prepare and\nmeasure proto
 cols and the known two-way communication reconciliation\ntechniques. We ob
 tain a necessary and sufficient condition for key\ndistillation\, in arbit
 rary dimension. This may imply existence of weakly\nentangled states from 
 which a secret key cannot be distilled.
LOCATION:MR14\, Centre for Mathematical Sciences
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