首页|Measuring small longitudinal phase shifts via weak measurement amplification
Measuring small longitudinal phase shifts via weak measurement amplification
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Weak measurement amplification,which is considered as a very promising scheme in precision measurement,has been applied to various small physical quantities estimations.Since many physical quantities can be converted into phase signals,it is interesting and important to consider measuring small longitudinal phase shifts by using weak measurement.Here,we propose and experimentally demonstrate a novel weak measurement amplification-based small longitudinal phase estimation,which is suitable for polarization interferometry.We realize one order of magnitude amplification measurement of a small phase signal directly introduced by a liquid crystal variable retarder and show that it is robust to the imperfection of interference.Besides,we analyze the effect of magnification error which is never considered in the previous works,and find the constraint on the magnification.Our results may find important applications in high-precision measurements,e.g.,gravitational wave detection.
weak measurementphase estimationquantum optics
徐凯、胡晓敏、胡孟军、王宁宁、张超、黄运锋、柳必恒、李传锋、郭光灿、张永生
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CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China
CAS Center For Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China
Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China
Beijing Academy of Quantum Information Sciences,Beijing 100193,China
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国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Innovation Programme for Quantum science and Technology国家重点研发计划USTC Center for Micro and Nanoscale Research and FabricationMeng-Jun Hu is supported by Beijing Academy of Quantum Information Sciences
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