Optical: systems and elements – Optical frequency converter
Reexamination Certificate
2007-03-01
2009-08-04
Sanghavi, Hemang (Department: 2874)
Optical: systems and elements
Optical frequency converter
C398S152000, C372S021000, C380S278000
Reexamination Certificate
active
07570419
ABSTRACT:
In one embodiment of the present invention, a quantum entangled photon-pair producing device is disclosed which includes a superposed state generating device for generating a superposed state of photon-pairs entering through N (N≧2) different incident optical paths and being composed of photons having different polarization directions, and a light-guide device for separating the photon-pairs entering through the N (e.g. N is two) incident optical paths into photons having a first polarization direction (e.g. horizontally polarized light) and those having a second polarization direction (e.g. vertically polarized light) and guiding the photons having the first polarization direction and entering through the i-th (1≦i≦N) (e.g. the first) incident optical path and photons having the second polarization direction and entering through the (N−i+1) (e.g. the second) incident optical path to the i-th (e.g. the first) exit optical path through optical paths having the same optical path length. Therefore, quantum entangled photons of N channels having a quantum correlation with regard to the polarization direction can be produced. With this, a quantum entangled photon-pair producing device capable of producing quantum entangled photon-pairs of multi-channel having a quantum correlation with regard to the polarization direction with high production efficiency is realized.
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Edamatsu Keiichi
Shimizu Ryosuke
Harness & Dickey & Pierce P.L.C.
Japan Science and Technology Agency
Sanghavi Hemang
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