Intensity correlation measurements were used to verify the single photon emission in pulsed and continuous operation. By using Fourier spectroscopy, the coherence length and spectral bandwidth of the single-photon states was measured. The observation of cross-correlations between several spectral lines revealed the existence of multi-photon cascades and gave information about their decay dynamics.
The efficient separation of adjacent photons from a two-level cascade allowed their independent use and an effective doubling of the photon generation rate, similar to multiplexing in classical information processing. For the first time, multiplexing on a single-photon level could be demonstrated in a quantum key distribution experiment.
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