Patent ID: 7649679

Claim:
A photon pair generating device, comprising: a light source that emits a first light and a second light having different frequencies with reverse polarization rotation directions to each other; a resonator which includes a correlation photon pair generating member; wherein the resonator is irradiated by a first photon from the first light source and a second photon from the second light source, the first photon and the second photon, with reverse polarization rotation directions to each other, have different frequencies from each other; and the resonator is provided to resonate the irradiated first and second photons so that the intensity of the light is enhanced, wherein the correlation photon pair generating member causes (i) the received first and second photons to exit the resonator in resonance so that an exciton molecule is generated and (ii) a third photon and a fourth photon having a quantum correlation to each other to be emitted as a correlation photon pair in response to a decay of the exciton molecule.