PROBLEM TO BE SOLVED: To enable the generation of a photon pair in a state of being quantum entangled further efficiently.;SOLUTION: A quantum entangled photon pair generating device comprises: a mesa structure including a laminate of a second semiconductor layer 102 formed from an n-type second semiconductor and a third semiconductor layer 106; and a quantum dot 103 disposed between the second semiconductor layer 102 and the third semiconductor layer 106, and formed from a non-doped third semiconductor smaller than the second semiconductor in band gap. It becomes a key that the quantum dot 103 is arranged to have a size large enough to allow two holes to be just fit therein at a time. The quantum entangled photon pair generating device further comprises a superconductor layer 104 and a metal layer 105. The metal layer 105 has an opening 105a on the side of the third semiconductor layer 106, and is formed so as to surround the periphery of the above mesa structure.;COPYRIGHT: (C)2016,JPO&INPIT
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