Cryptography – Communication system using cryptography – Fiber optic network
Reexamination Certificate
2008-04-15
2008-04-15
Zia, Syed A. (Department: 2131)
Cryptography
Communication system using cryptography
Fiber optic network
C380S277000, C380S278000, C380S255000
Reexamination Certificate
active
11260705
ABSTRACT:
A narrow-band single-photon source (10) is disclosed, along with a QKD system (200) 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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Trifonov Alexei
Zavriyev Anton
MagiQ Technologies, Inc.
Opticus IP Law PLLC
Zia Syed A.
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