Abstract:
Current quantum cryptography systems are limited by the attenuated coherent pulses they use as light sources: a security loophole is opened up by the possibility of multiple-photon pulses. By replacing the source with a single-photon emitter, transmission rates of secure information can be improved. We have investigated the use of single self-assembled InAs/GaAs quantum dots as such single-photon sources, and have seen a tenfold reduction in the multi-photon probability as compared to Poissonian pulses. An extension of our experiment should also allow for the generation of triggered, polarization-entangled photon pairs. The utility of these light sources is currently limited by the low efficiency with which photons are collected. However, by fabricating an optical microcavity containing a single quantum dot, the spontaneous emission rate into a single mode can be enhanced. Using this method, we have seen 78% coupling of single-dot radiation into a single cavity resonance. The enhanced spontaneous decay should also allow for higher photon pulse rates, up to about 3 GHz.
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Received 8 July 2001 and Received in final form 25 August 2001
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Pelton, M., Santori, C., Solomon, G. et al. Triggered single photons and entangled photons from a quantum dot microcavity. Eur. Phys. J. D 18, 179–190 (2002). https://doi.org/10.1140/epjd/e20020022
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DOI: https://doi.org/10.1140/epjd/e20020022