公开(公告)号：US20240152026A1

公开(公告)日：2024-05-09

申请号：US18548393

申请日：2022-03-04

Applicant: Kyoto University

Inventor： Shigeki TAKEUCHI ,  Hideaki TAKASHIMA ,  Yu MUKAI

IPC: G02F1/39 ,  G01J3/02 ,  G01J3/10 ,  G01J3/453

CPC classification number: G02F1/395 ,  G01J3/0218 ,  G01J3/10 ,  G01J3/453

Abstract: A quantum absorption spectroscopy system (1) includes a pump light source (11), a quantum interferometer (21), and a spectroscope (31). The pump light source (11) emits pump light. The quantum interferometer (21) causes quantum interference between a plurality of physical processes in which a quantum entanglement photon pair of a signal photon and an idler photon is generated through spontaneous parametric down-conversion of the pump light, a sample being arranged on a propagation path of the idler photon. The spectroscope (31) detects a signal photon from the quantum interferometer (21). The quantum interferometer (21) includes a single mode fiber (SMF) portion optically coupled to at least part of a propagation path of the signal photon and the propagation path of the idler photon.

公开(公告)号：US20240385043A1

公开(公告)日：2024-11-21

申请号：US18694232

申请日：2022-09-08

Applicant: KYOTO UNIVERSITY

Inventor： Shigeki TAKEUCHI ,  Yu MUKAI ,  Ryo OKAMOTO

IPC: G01J3/433 ,  G01J3/02 ,  G01J3/12 ,  G01J3/26 ,  G01J3/28 ,  G02F1/35 ,  G02F1/355

Abstract: An image sensor (3) includes a light receiving surface on which a plurality of pixels are disposed, and detects a signal photon. A memory (42) stores, as a map, a correspondence between a parameter indicating the position of each pixel on the light receiving surface and the wavelength of the signal photon detected by the pixel. A processor (41) executes arithmetic processing for calculating the spectral characteristic of a sample disposed on an optical path of an idler photon. An optical system (21) includes a moving mirror (209) configured to apply modulation to the phase of 10 quantum interference. The processor (41) acquires, from a predetermined number of pixels disposed on the light receiving surface, a variation in a detection intensity of the signal photon generated by the modulation by moving mirror (209), and calculates the spectral characteristic based on the visibility of the quantum interference obtained from the variation and the map.

公开(公告)号：US20230020945A1

公开(公告)日：2023-01-19

申请号：US17757100

申请日：2020-12-04

Applicant: Kyoto University

Inventor： Shigeki TAKEUCHI ,  Ryo OKAMOTO ,  Yu MUKAI

IPC: G01J3/42 ,  G02F1/35 ,  G01N21/45

Abstract: A quantum absorption spectroscopy system (100) includes a laser light source (1), a quantum optical system (201), a photodetector (31), and a controller (4). The laser light source (1) emits pump light. The quantum optical system (201) includes a nonlinear optical crystal (23) that generates a quantum entangled photon pair of a signal photon and an idler photon by irradiation with pump light, and a moving mirror (25) that changes a phase of the idler photon, and causes quantum interference between a plurality of physical processes in which the quantum entangled photon pair is generated. The photodetector (31) detects the signal photon when the phase of the idler photon is changed by the nonlinear optical crystal (23) in a state where a sample is disposed on an optical path of the idler photon, and outputs a quantum interference signal corresponding to the detected number of photons. The controller (4) calculates an absorption spectroscopy characteristic of the sample by performing Fourier transform on the quantum interference signal.