Method and system for detecting diamond color center spin in sensing way based on microwave phase modulation spectroscopy technology

Abstract

The invention discloses a method for detecting diamond color center spin in a sensing way based on a microwave phase modulation spectroscopy technology. The method comprises the following steps: (1) symmetrically installing a microwave transmitting end (4) and a microwave receiving end (5) at the inner side of a diamagnetic circular ring (8), wherein the microwave transmitting end (4) is connected with a microwave source, and the microwave receiving end (5) is connected with a data acquisition port of a field programmable gate array (FPGA) or a signal input end of an oscilloscope card, or the microwave receiving end (5) is respectively connected with the signal input end of the oscilloscope card and the data acquisition port of the FPGA by a port divider. According to the method, resonance signals of diamond color center atoms are detected in combination of the microwave phase modulation spectroscopy technology, the electronic energy level is excited by using laser, an external magnetic field is scanned, and the change of microwave signals is detected by means of an absorptive action of a diamond color center ground state energy level for a microwave field, so that color center spin information is read. The detection method is simple and convenient and high in accuracy, eliminates the complexity and instability of a light path, and increases the signal-to-noise ratio of atomic magnetic resonance.

Description

technical field [0001] The invention belongs to the field of quantum information calculation, and specifically relates to detecting electron spin information of diamond NV color centers based on microwave phase modulation spectrum technology. Background technique [0002] Since the nucleus carries electric charges, when the nucleus spins, a magnetic moment will be generated by the spin. The direction of this magnetic moment is the same as the spin direction of the nucleus, and its magnitude is proportional to the spin angular momentum of the nucleus. Put the diamond in the external magnetic field, when the magnetic moment of the atomic nucleus is different from the direction of the external magnetic field, the magnetic moment of the atomic nucleus in the diamond will rotate around the direction of the external magnetic field, similar to the rotation of a gyroscope around its axis during the rotation process, which is Lamor precession. The precession frequency of the nucleus ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the complexity of the optical path in the existing solid diamond atomic spin detection method and the optical interference problem existing in the optical signal readout process, in order to improve the detection accuracy of the electronic spin information of the diamond NV color center, the present invention proposes a The diamond atomic spin information readout method of the phase modulation spectrum technology simplifies the traditional experimental optical path of using optical signals to read out the spin state, solves the interference problem of excitation light, and improves the signal-to-noise ratio

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