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SUMMARY:Quantum correlated photons in arrays of weakly nonlinear cavities 
 - Vincenzo Savona(EPFL)
DTSTART:20120130T153000Z
DTEND:20120130T170000Z
UID:TALK35173@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Recent progress in nanotechnology has made it possible to fabr
 icate various kinds of optical nanocavities - embedding a nonlinear optica
 l medium - in which a sizeable nonlinearity arises already at the level of
  single photon occupation. Arrays of these nanocavities bear a close analo
 gy with strongly correlated systems in condensed matter and atomic physics
 \, but with the added possibility of selective coherent optical control of
  each individual cavity mode. This unique combination of features makes th
 e system ideal for the generation and control of quantum correlated states
  of many photons\, and ultimately for the investigation of a large variety
  of many-body phenomena in a quantum simulator fashion. Due to the dissipa
 tive nature of the optical cavities however\, in order for quantum correla
 tions to build up from interactions\, a stringent requirement is that the 
 two-body interaction energy be much larger than the dissipation rate. Para
 meters of current state-of-the-art systems lie still significantly behind 
 this minimal requirement.\n\n \n\nI propose a way to overcome this obstacl
 e\, by demonstrating that quantum correlations can arise in an array of we
 akly nonlinear cavities from the interplay of small nonlinear energy shift
 s and quantum interference between different excitation pathways. By solvi
 ng the full master equations for small arrays\, I show how this mechanism 
 allows for the generation of photons with sub-poissonian statistics\, and 
 of cluster-entangled states of few photons\, required by the "one-way quan
 tum computation" paradigm. The simulations show that these phenomena are e
 xpected for realistic values of the nonlinearity\, dissipation and decoher
 ence rates\, that are easily available\, for example\, in polaritonic micr
 opillars or photonic crystal cavities with embedded quantum dots. \n\n \n\
 nT. C. H. Liew and V. Savona\, Phys. Rev. Lett. 104\, 183601 (2010).\n\nT.
  C. H. Liew and V. Savona\, Phys. Rev. A 84\, 032301 (2011).\n\nT. C. H. L
 iew and V. Savona\, arXiv:1111.0826.\n\n
LOCATION:Rutherford building\, Seminar Room B
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