Generation of strongly polarization‐correlated photon pairs by cascaded emission from individual CdSe/ZnSe quantum dots

By combined pulsed auto‐ and cross‐correlation measurements (4 K) on individual self‐assembled CdSe quantum dots, besides triggered single photon emission promising for high repetition frequencies, in particular the generation of time‐correlated photon pairs from the sequential radiative biexciton‐exciton decay is demonstrated. For the photon pairs a strong collinear polarization degree up to 84.5% was observed which is related to an exciton fine‐structure splitting. Together with the measured exciton lifetime an estimate for the relaxation time (≥480 ps) between the fine‐structure levels is given.

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