Abstract: The present disclosure provides a system and method for measuring resonance frequencies of a quantum sensor based on multi-photon excitation. The system includes a probe laser module, a coupling laser module, a quantum sensor, a fast measurement module, an experimental signal source, and a measurement and calculation module. The experimental signal source directly faces the quantum sensor, and is configured to transmit a RF electromagnetic signal to the quantum sensor. The quantum sensor includes a closed glass cavity. An alkali metal atomic vapor is enclosed in the glass cavity. The probe laser module is connected to one side of the quantum sensor, and the coupling laser module is connected to the other side of the quantum sensor through the fast measurement module.

Abstract: The present application provides a phosphatidylcholine product represented by formula (I) and a fatty acid composition containing same. In formula (I), R1 and R2 are each independently selected from residues of saturated or unsaturated fatty acids having more than 12 carbon atoms; and R1 and R2 comprise an EPA residue and a DHA residue. The phosphatidylcholine product represented by formula (I) and fatty acid composition provided by the present application can improve damage of IBD model animal colon tissues to a certain extent, have certain anti IBD activity, and are superior to the first-line drug, sulfasalazine.