NV (Nitrogen-Vacancy) color center automatic phase control circular polarization microwave control system and method

Abstract

The invention discloses an NV (Nitrogen-Vacancy) color center automatic phase control circular polarization microwave control system and method. The system comprises a diamond sample, a signal sourcesystem, a signal processing system, a microwave radiation system, a control system and the like, wherein the signal source system can provide a microwave signal; after the signal is amplified and passthrough a circular polarization microstrip antenna in the microwave radiation system, since the coaxial feed of the antenna causes a situation that the microwave radiation system can radiate microwaves to the diamond sample, the special shape and size design of the circular polarization microstrip antenna and the regulation of a feed point position can meet a circular polarization condition, andthe rotation direction of polarization is regulated. The system has the advantages of simple experiment environment, small size, small energy consumption and good robustness, is convenient in controlling the overturning among electron spin ground state energy levels, and provides support for diamond color center-based technologies including quantum calculation, quantum sensing, quantum transmission and the like.

Description

technical field [0001] The invention relates to the technical field of quantum precision measurement, in particular to an automatic phase control circular polarization microwave control system and method for diamond nitrogen-vacancy color center energy levels. Background technique [0002] The process of quantum precision measurement by diamond NV color centers includes three processes: spin polarization, spin manipulation and spin detection. The measurement system mainly includes: optical control system, microwave control system, magnetic field control system, etc. Among them, the microwave control system uses circularly polarized microwaves to precisely control the inversion of the ground state energy level of the electron spin of the color center, which provides an important basis for quantum precision measurement of the diamond color center. In high-concentration diamond materials, it is very difficult to precisely control the ground state energy level of the color cent...

AI Technical Summary

Problems solved by technology

The existing circularly polarized microwave control system for the ground state energy level of the diamond color center usually needs to use the functions of the beam splitter and the phase shifter to meet the conditions for realizing circularly polarized microwave. The microwave control system is large in size, high in cost, and quantum Precision measurement experiments require broadband circularly polarized microwave magnetic fields with low return loss

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