A displacement fiber optic sensor integrating a double-layer metasurface was proposed and simulated. The sensor consists of two parallel single-mode optical fibers, which are encapsulated in glass tubes at the connection. The fiber end face is integrated with the sub surface of the medium. The displacement change of the structure is determined by the drift of the center wavelength of the transmission spectrum. When the glass tube undergoes displacement under stress, the length of the cavity changes accordingly. By tracking the drift of the central wavelength in the transmission spectrum, its displacement can be determined. Results show that the measurement resolution of the microfiber displacement sensor can reach the nm level, and it has great application prospects in precision sensing measurement of small displacements.
We investigate the phase sensitivity of a Mach-Zehnder Interferometer (MZI) with an input of a non-Gaussian quantum entangled state, Two-Mode Photon-Subtracted Squeezed Vacuum states (TMPSSV). Parity detection is carried out at the output of the interferometer to obtain the phase uncertainty, which is a physical parameter that can quantify the sensitivity of interferometry. According to the simulation results, TMPSSV has a smaller phase uncertainty than the Two-Mode Squeezed Vacuum state (TMSV) in the entire range of the squeezing parameter which means the sensitivity of interferometry based on TMPSSV is higher than that of TMSV. Therefore, non-Gaussian entanglement based on TMPSSV provides a promising quantum resource for an ultra-sensitivity optical interferometer far beyond the standard quantum limit.
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