Narrow-band single-photon source and QKD system using same
A narrow-band single-photon source is disclosed, along with a QKD system using same. The single-photon source is based on spontaneous parametric downconversion that generates signal and idler photons (PS and PI) as an entangled photon pair. Narrow-band signal photons are generated by selectively nar...
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| Main Authors | , |
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| Format | Patent |
| Language | English |
| Published |
15.04.2008
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| Online Access | Get full text |
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| Summary: | A narrow-band single-photon source is disclosed, along with a QKD system using same. The single-photon source is based on spontaneous parametric downconversion that generates signal and idler photons (PS and PI) as an entangled photon pair. Narrow-band signal photons are generated by selectively narrow-band-filtering the idler photons. This results in a non-local filtering of the signal photons due to the time-energy entanglement of the photon pair. Subsequent detection of the filtered idler photon establishes the narrow-band signal photon. The narrow-band single-photon source is particularly useful in a QKD system, wherein the narrow-band signal photons are used as quantum signals to mitigate the adverse effect of chromatic dispersion on QKD system performance. |
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