Triggered polarization-correlated photon pairs from a single CdSe quantum dot

Ulrich, S. M.; Strauf, S.; Michler, P.; Bacher, G.; Forchel, A.
September 2003
Applied Physics Letters;9/1/2003, Vol. 83 Issue 9, p1848
Academic Journal
We report on the generation of polarization-correlated photon pairs by the radiative biexciton (XX)-exciton (X) cascade of single CdSe quantum dots (QDs). Under nonresonant optical pulsed excitation (76 MHz) at low temperature (4 K), a high collinear correlation degree of 74.5% was observed from cross-correlation measurements between single XX and X emissions, which reflects an asymmetry-induced exciton fine-structure splitting. In consideration of the excitonic radiative lifetime (250 ps) this effect allows for direct conclusions about the relaxation time (T>=480 ps) between the corresponding sublevels. Our results also suggest that the biexciton-exciton cascade in a CdSe QD is well suited for triggered single photon and/or photon pair generation rates above 1 GHz. © 2003 American Institute of Physics.


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