Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster 2: Intersectional Session
Q 23.54: Poster
Dienstag, 15. März 2011, 18:00–21:00, P1
How well can photons change their colour - about the efficiency of single photon frequency down-conversion — •Susanne Blum1, Georgina Olivares-Rentería2,3, Carlo Ottaviani3, Sebastian Zaske1, Christoph Becher1, and Giovanna Morigi1,3 — 1Universität des Saarlandes, Germany — 2Universidad de Concepción, Chile — 3Universitat Autònoma de Barcelona, Spain
Efficient single photon transmission in future quantum networks requires wavelengths in the low loss band of optical fibres. Currently most single photon sources do not emit in this spectral region, but rather in the red or near-infrared. We analyse theoretically the conversion efficiency of single photons into the low-loss band at 1550nm, when using difference frequency generation in a χ(2) material. For this purpose we use Heisenberg-Langevin equations for the signal, idler, and pump fields, in the limit of a strong classical signal field. We consider the effects of quantum noise sources, e.g. photon loss in pump and idler modes, and photon generation at 1550nm due to optical parametric fluorescence. From this model we study the efficiency of the single photon down-conversion process by determining the value of intensity-intensity correlations at zero delay and the influence of quantum noise sources on photon correlation funtions.