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Chin. Phys. B, 2023, Vol. 32(1): 010306    DOI: 10.1088/1674-1056/ac981d
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Tolerance-enhanced SU(1,1) interferometers using asymmetric gain

Jian-Dong Zhang(张建东) and Shuai Wang(王帅)
School of Mathematics and Physics, Jiangsu University of Technology, Changzhou 213001, China
Abstract  SU(1,1) interferometers play an important role in quantum metrology. Previous studies focus on various inputs and detection strategies with symmetric gain. In this paper, we analyze a modified SU(1,1) interferometer using asymmetric gain. Two vacuum states are used as the input and on-off detection is performed at the output. In a lossless scenario, symmetric gain is the optimal selection and the corresponding phase sensitivity can achieve the Heisenberg limit as well as the quantum Cramer-Rao bound. In addition, we analyze the phase sensitivity with symmetric gain in the lossy scenario. The phase sensitivity is sensitive to internal losses but extremely robust against external losses. We address the optimal asymmetric gain and the results suggest that this method can improve the tolerance to internal losses. Our work may contribute to the practical development of quantum metrology.
Keywords:  SU(1      1) interferometer      asymmetric gain      Heisenberg limit      quantum Cramer-Rao bound  
Received:  09 August 2022      Revised:  20 September 2022      Accepted manuscript online:  07 October 2022
PACS:  03.67.-a (Quantum information)  
  42.50.St (Nonclassical interferometry, subwavelength lithography)  
Fund: Project supported by Leading Innovative Talents in Changzhou (Grant No. CQ20210107), Shuangchuang Ph.D Award (Grant No. JSSCBS20210915), Natural Science Research of Jiangsu Higher Education Institutions of China (Grant No. 21KJB140007), and the National Natural Science Foundation of China (Grant No. 12104193).
Corresponding Authors:  Jian-Dong Zhang     E-mail:

Cite this article: 

Jian-Dong Zhang(张建东) and Shuai Wang(王帅) Tolerance-enhanced SU(1,1) interferometers using asymmetric gain 2023 Chin. Phys. B 32 010306

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