QUANTUM ENTANGLED-STATE PHOTON SOURCE FOR SUPER-RESOLUTION OPTICAL INTERFEROMETRY

摘要

A quantum entangled-state photon generating device for super-resolution optical interferometry is provided to utilize a heralded photon using SPDC(Spontaneous Parametric Down-Conversion) and a photon detector, thereby improving production efficiency and obtaining a quantum light source where noise caused by an undesired photon is low. First to third photonic crystals(52,62,72) respectively generates two photons from one of photons, generated in first to third light sources(50,60,70), through an SPDC process. A first beam splitter(66) reflects a part of a photon and transmits a part of the photon. In the first beam splitter, the two photons generated in the first photonic crystal are respectively applied to two input terminals. A second beam splitter(67) reflects a part of a photon and transmits a part of the photon. In the second beam splitter, one photon of the two photons generated in the second photonic crystal and a photon applied to one output terminal of the first beam splitter are respectively applied to two input terminals. A third beam splitter(68) reflects a part of a photon and transmits a part of the photon. In the third beam splitter, one photon of the two photons generated in the third photonic crystal and a photon applied to the other one output terminal of the first beam splitter are respectively applied to two input terminals. A fourth beam splitter(69) reflects a part of a photon and transmits a part of the photon. In the fourth beam splitter, a photon applied to one output terminal of the second beam splitter and a photon applied to one output terminal of the third beam splitter are respectively applied to two input terminals. A first photon detector(75) generates an electric signal by detecting one photon of the two photons generated in the second photonic crystal. A second photon detector(77) generates an electric signal by detecting one photon of the two photons generated in the third photonic crystal.