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SUMMARY:Quantum optical switch controlled by a colour centre in a diamond 
 nanocavity - Alp Sipahigil (Harvard)
DTSTART:20160321T153000Z
DTEND:20160321T170000Z
UID:TALK64544@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Efficient interfaces between photons and quantum emitters form
  the basis for quantum networks and enable nonlinear optical devices opera
 ting at the single-photon level. By coupling silicon-vacancy (SiV) color c
 enters to a diamond nanophotonic device\, we realize a quantum optical swi
 tch controlled by a single atom-like crystal defect. In our approach\, SiV
  centers are deterministically positioned in diamond photonic-crystal cavi
 ties using targeted silicon implantation. We observe that the cavity trans
 mission is substantially attenuated by a single SiV center\, is nonlinear 
 at less than one photon per system's bandwidth and can be switched by opti
 cally controlling SiV metastable orbital states. Photon correlation measur
 ements are used to verify optical switching at the single-photon level. Ou
 r approach enables the realization of fully integrated\, scalable nanophot
 onic quantum devices
LOCATION:Ryle Seminar (Rutherford 930)
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