Quantum entanglement photon-pair producing device (100) comprises superposed state causing means (110) for causing photon-pair superposed state of photon-pairs entering through N (N≥2) different entrance optical paths and composed of photons having different polarization directions and light-guide means (120) for separating the photon-pairs entering through the N (e.g., N is two) entrance optical paths (La, Lb) 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) entrance optical path (La) and photons having the second polarization direction and entering through the (N-i+1) (e.g., the second) entrance optical path (Lb) to the i-th (e.g., the first) exit optical path (La’) through optical paths having the same optical path length. Therefore, quantum entanglement photons |Ψout of N channels having a quantum correlation about the polarization direction can be produced. With this, a quantum entanglement photon-pair producing device capable of producing quantum entanglement photon-pairs of multi-channels having a quantum correlation about the polarization direction with high production efficiency is realized.
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