Diamond nanocrystal single-photon source with wavelength converter
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United States of America Patent
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Issued Date -
Feb 5, 2009
app pub date -
Jul 30, 2007
filing date -
Jul 30, 2007
priority date (Note) -
Abandoned
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Abstract
A single-photon source (SPS) (10) adapted to output single-photons (P3) at telecommunication wavelengths is disclosed. The SPS includes a color-centered diamond-nanocrystal (CCDN) single-photon source (SPS) (20) adapted to emit input photons (P1) having a wavelength A.sub.1 that lies outside of the main telecommunication wavelength bands. A non-linear optical medium (50) pumped using pump photons (P2) of wavelength A.sub.2 receives the input photons and optically downconverts them to output photons (P3) having a wavelength .lamda..sub.3>.lamda..sub.1 wherein .lamda..sub.3 is within a telecommunication wavelength band. An optical filter (60) arranged downstream of the non-linear optical medium substantially blocks the pump photons (P2) while allowing for the transmission of the output photons. A QKD system that uses the SPS source of the present invention is also disclosed.
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