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SUMMARY:Electromagnetically induced transparency with single atoms in a ca
 vity - Dr Stephan Ritter (Max-Planck-Institute)
DTSTART:20100906T143000Z
DTEND:20100906T160000Z
UID:TALK26151@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:A single atom trapped at the center of a high-finesse optical 
 cavity is an\nideal starting point for studying the coherent interaction b
 etween light and\nmatter. At the same time\, it provides great possibiliti
 es for quantum\ninformation processing\, exemplified by our demonstration 
 of efficient\,\nlossless hyperfine state detection based on the Purcell ef
 fect [1]. Making\nuse of the rich level structure of 87Rb\, it is possible
  to go beyond the\nJaynes-Cummings physics. A three-level system in a lamb
 da configuration\ninside the cavity allows for the efficient generation of
  single photons with\ntheir temporal\, spectral and\npolarization properti
 es accurately controlled. This allows for the\ngeneration of atom-photon a
 nd photon-photon entanglement\, an ideal starting\npoint for the realizati
 on of a distributed quantum network.\nQuantum interference in the amplitud
 es of the two optical transitions can\nlead to electromagnetically induced
  transparency (EIT)\, where the presence\nof a weak control beam drastical
 ly alters the optical properties of the\nmedium. Inside an optical cavity\
 , this effect is highly enhanced and we have\nobserved it for a few and ev
 en single atoms [2]. The high electric field per\nphoton should allow for 
 nonlinear interactions between single photons\nmediated by single atoms\, 
 which is appealing for future applications in\nquantum information process
 ing.\n\n[1] J. Bochmann et al.\, Phys. Rev. Lett. 104\, 203601 (2010)\n[2]
  M. Mücke et al.\, Nature 465\, 755 (2010)\n\n
LOCATION:Rutherford building\, Seminar Room B
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