Optical fiber quantum temperature sensing based on single photon interferometer

A high precision optical fiber quantum temperature sensor based on single photon interferometer by combining the advantages of fiber interferometric structures and quantum sensing technology is designed. We define the measurement precision as the standard deviation of transmissivity, and the estimation strategy of Fisher informa-tion analysis is used to analyze whether the measurement precision is beyond the standard quantum limit. The findings of the experiments demonstrate that the proposed quantum sensor's measurement errors are entirely consistent with quantum theory and that the detection errors approach or even exceed the standard quantum limit. The suggested sensor has a temperature sensitivity of around 0.00115/ degrees C and excellent reversibility. The temperature resolution of the sensing system can be calculated to be 0.029 degrees C. In this work, both precision and resolution are good enough, it is possible to resolve small temperature changes, which offers a fresh approach for the development of high-end industrial and medical applications.