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SUMMARY:Excitons and photons in cavity-embedded quantum dot lattices - Dr 
 Michal Grochol (Instut Fur Theoretische Physik\, Germany)
DTSTART:20091215T113000Z
DTEND:20091215T130000Z
UID:TALK21875@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:We investigate excitons and trions in a two-dimensional quantu
 m dot lattice embedded in a planar optical cavity. The strong exciton (tri
 on)-photon coupling is described in terms of polariton quasiparticles with
  extremely small mass\, which makes them the lightest exciton-like quasipa
 rticles in solids. The effect of disorder is also discussed.\n Furthermore
 \, one electron is added into each dot. Such a "spin lattice" can be used 
 for quantum information processing and we show that by using exciton detun
 ing a conditional phase shift gate with a high fidelity can be obtained. F
 inally\, we investigate exciton-photon quantum phase transitions in a plan
 ar lattice of one-mode cavities containing one quantum dot. We demonstrate
  that by controlling exciton- and photon-hopping energies a very rich scen
 ario of coupled fermionic-bosonic quantum phase transitions appears.\n
LOCATION:TCM Seminar Room\, Cavendish Lab.\, JJ Thomson Ave.\,Cambridge CB
 3 OHE
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