Patent ID: 8488231

Claim:
A wavelength-multiplexed polarization entangled photon pair generator, including: a pump light source; a nonlinear optical crystal on which the pump light output from the pump light source falls; and a spectrometer on which a wavelength-multiplexed parametric photon pair output from the nonlinear optical crystal falls, wherein the nonlinear optical crystal has a periodically poled structure, a type II phase matching is conducted to generate a parametric optical pair whose angular frequency relation satisfies the energy conservation law expressed by equitation (6) shown below and whose polarized light crosses orthogonal to each other, and the spectrometer branches the parametric photon pair so that angular frequency becomes ω 0 , ω 1 , ω 2 , . . . , ω n-2 , ω n-1 , ω n , thereby generating a wavelength-multiplexed polarization entangled photon pair for each ω p = ⁢ ω 0 + ω n = ⁢ ω 1 + ω n - 1 = ⁢ ω 2 + ω n - 2 ⁢ … ⁢ . ( 6 )