Multi-path(or multi-mode)entanglement has been proved to be a useful resource for sub-shot-noise sensitivity of phase estimation,which has aroused much research interest in quantum metrology recently.Various schemes o...Multi-path(or multi-mode)entanglement has been proved to be a useful resource for sub-shot-noise sensitivity of phase estimation,which has aroused much research interest in quantum metrology recently.Various schemes of multi-path interferometers based on optical systems have been put forward.Here,we study a multi-state interferometer with multilevel atoms by projective measurements.Specifically,we investigate its ultimate sensitivity described by quantum Fisher information theory and find that the Cramer-Rao bound can be achieved.In particular,we investigate a specific scheme to improve the sensitivity of magnetometery with a three-state interferometry delivered by a single nitrogen-vacancy(NV)center of diamond with tailor pulses.The impacts of imperfections of the atomic beam-splitter,described by the three-level quantum Fourier transform,on the sensitivity of phase estimation is also discussed.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.11974290)。
文摘Multi-path(or multi-mode)entanglement has been proved to be a useful resource for sub-shot-noise sensitivity of phase estimation,which has aroused much research interest in quantum metrology recently.Various schemes of multi-path interferometers based on optical systems have been put forward.Here,we study a multi-state interferometer with multilevel atoms by projective measurements.Specifically,we investigate its ultimate sensitivity described by quantum Fisher information theory and find that the Cramer-Rao bound can be achieved.In particular,we investigate a specific scheme to improve the sensitivity of magnetometery with a three-state interferometry delivered by a single nitrogen-vacancy(NV)center of diamond with tailor pulses.The impacts of imperfections of the atomic beam-splitter,described by the three-level quantum Fourier transform,on the sensitivity of phase estimation is also discussed.
