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SUMMARY:Quantum photonics with color centers in diamond - Christoph Becher
  (University of Saarland)
DTSTART:20110328T143000Z
DTEND:20110328T160000Z
UID:TALK30081@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:In recent years color centers in diamond have attracted signif
 icant interest for applications in quantum information. Examples are the N
 V center which is well suited as quantum memory due to its long spin coher
 ence times and “new” color centers\, e.g. based on Cr or Si\, which ar
 e high-brightness single photon emitters. I will discuss fabrication and s
 pectroscopic investigation of such color centers\, in particular Silicon-v
 acancy centers\, for which we recently have demonstrated record high singl
 e photon emission rates and very narrow emission lines at room temperature
 . \n\nFor many of the applications in quantum information\, e.g. quantum n
 etworks\, it is essential to couple single color centers to a cavity mode 
 with high quality-factor Q and small modal volume in order to coherently m
 anipulate\, readout and transfer the center's quantum state. We follow two
  different routes towards realization of such optical interfaces: coupling
  to microcavities based on fiber mirrors or microcavities defined within d
 iamond-based photonic crystals (PhC). We demonstrate fiber-based cavities 
 with lengths of a few microns and finesse of few hundred\, sufficient for 
 observing modified spontaneous emission. For the second approach\, we pres
 ent optimized designs based on Fourier- and real space analysis of PhC def
 ect cavity structures. We fabricate PhC microcavities in quasi-single crys
 tal diamond by focused ion beam milling and dry etching techniques. First 
 structures show pronounced cavity modes near the emission wavelength of Si
 licon-vacancy centers. \n
LOCATION:Rutherford building\, Seminar Room B
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