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SUMMARY:Entangled photons on-demand from a single quantum dot - Mr Robert 
 Young\, SP Group\, Cavendish Laboratory
DTSTART:20060227T141500Z
DTEND:20060227T151500Z
UID:TALK4711@talks.cam.ac.uk
CONTACT:K DAS GUPTA
DESCRIPTION:A source of triggered entangled photon pairs is a vital commod
 ity for\nquantum information applications based on quantum optics. The mos
 t\ncommonly used source of entangled photon pairs currently\, parametric\n
 down conversion\, produces a probabilistic numbers of photons pairs per\ne
 xcitation cycle making them of limited use\, especially in quantum\ninform
 ation schemes. We demonstrate on-demand emission of\npolarisation-entangle
 d photon pairs from the biexciton cascade of a\nsingle InAs quantum dot em
 bedded in a GaAs/AlAs planar cavity\, the\nfirst semiconductor source of t
 riggered entangled photon emission.\nResults presented show that ~70% of t
 he photon pairs measured are\nentangled in the expected |HH>+|VV> basis.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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