US 12,241,949 B2
Quantum interference device
Kenta Matsumoto, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Filed by NEC Corporation, Tokyo (JP)
Filed on Feb. 23, 2023, as Appl. No. 18/113,202.
Claims priority of application No. 2022-029511 (JP), filed on Feb. 28, 2022.
Prior Publication US 2023/0273275 A1, Aug. 31, 2023
Int. Cl. G01R 33/035 (2006.01)
CPC G01R 33/0354 (2013.01) 17 Claims
OG exemplary drawing
 
1. A quantum interference device comprising a light generating unit configured to generate an excitation light having at least two frequency components, an alkali metal atom cell to which the excitation lights are emitted, a light detecting unit configured to detect a transmitted light from the alkali metal atom cell, and a control unit configured to execute a frequency determination process to determine a resonance frequency in a quantum interference state to be a reference based on the transmitted light, wherein
the control unit is configured to detect resonance frequencies in at least two quantum interference states from the transmitted light, and control the frequency determination process based on the detected resonance frequencies in the at least two quantum interference states and magnetic field information representing preset variation amounts of the resonance frequencies in the at least two quantum interference states with respect to a magnetic field.