Quantum Precision Measurement Of AC Magnetic Field Based On Nitrogen Vacancy Center In Diamond

Precision measurement is an important branch of physics,which is not only beneficial for engineering,such as aerospace or infrastructure,but also accelerates the development of the physics as some novel physics phenomena might be found in micro scale.Meanwhile,some measurement ideas involving the principle of quantum mechanics with much higher precision appeared.Then another branch of quantum physics named quantum precision measurement was gradually es-tablished,which achieved the standard quantum limit even Heisenberg quantum limit.Nitrogen-vacancy center(N-V center)is a solid state single spin quantum system with various excellent properties.Based on this system,we can imple-ment experiments about quantum computation,quantum simulation or quantum precision measurement.As we can initialize or readout the spin state of electron in NV system by a laser at room temperature and atmosphere pressure.We can also manipulate the spin states of electron or nuclei by microwave or radio frequen-cy.Moreover,some terms in the Hamiltonian of NV center system are sensitive to temperature,electromagnetic field and interaction between spins,which could also be detected by NV center by quantum precision measurement methods.This thesis is mainly about the quantum precision measurement based on NV center system.We propose an experiment to measure the amplitude and fre-quency of unknown alternating current magnetic field based on detecting Bloch-Siegert(BS)shift.Compared by the previous methods,this strategy can be im-plemented at room temperature and atmosphere pressure with high precision,bandwidth and space resolution.Another experiment to improve the precision of hyperfine coupling constants between electron and Nitrogen nuclei and the quadrupole moment of nitrogen nuclei is proposed.In this experiment,Free Induction Decay(FID)method pro-motes the precision of frequency measurement to standard quantum limit,which is the most accurate precision that current methods can achieve.In this experi-ment,we found that the precisions of several other constants in NV center system are supposed to be improved by FID method if we generalize our experiment to measure more frequencies.We believe our effort in this experiment is a good way of boosting scientific understanding of NV center system.