Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2006-05-23
2006-05-23
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C359S330000
Reexamination Certificate
active
07049574
ABSTRACT:
An apparatus for generating a specified number of photons whose generating time is known, and further an apparatus for generating a specified number of photons in the known schedule are provided. The particularly important specified number is 1 and it is able to be applied to quantum cryptographic communication. The apparatus comprises a photon pair source for generating a photon pair that comprises a signal photon and an idler photon and correlates with the generating time, photon number detectors for detecting the photon number of idler photons, a controller for controlling the gate device in conformity with the information on the photon number form the photon number detector, and a gate device for controlling the emission of the signal photon.
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Jungsang Kim, et al. “Multiphoton Detection Using Visible Light Photon Counter,” Applied Physics Letters, American Institute of Physics, vol. 74, No. 7, Feb. 15, 1999, pages 902-904.
P. G. Kwiat, et al., “Absolute Efficiency and Time-Response Measurement of Single-Photon Detectors,” Applied Optics, Optical Society of America, vol. 33, No. 10, Apr. 1, 1994, pages 1844-1853.
Luu Thanh X.
Mitsubishi Denki & Kabushiki Kaisha
Sohn Seung C.
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