中国物理B ›› 2018, Vol. 27 ›› Issue (1): 14203-014203.doi: 10.1088/1674-1056/27/1/014203

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Super-sensitive phase estimation with coherent boosted light using parity measurements

Lan Xu(许兰), Qing-Shou Tan(谭庆收)   

  1. 1 College of Physics and Electronic Engineering, Hainan Normal University, Haikou 571158, China;
    2 School of Mathematics and Computational Sciences, Hunan First Normal University, Changsha 410205, China;
    3 Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China
  • 收稿日期:2017-08-08 修回日期:2017-09-11 出版日期:2018-01-05 发布日期:2018-01-05
  • 通讯作者: Qing-Shou Tan E-mail:qingshoutan@163.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11665010), the Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, China (Grant No. QSQC1414), and the Scientific Research Fund of Hunan Provincial Education Department, China (Grant No. 17B055).

Super-sensitive phase estimation with coherent boosted light using parity measurements

Lan Xu(许兰)1,2,3, Qing-Shou Tan(谭庆收)1   

  1. 1 College of Physics and Electronic Engineering, Hainan Normal University, Haikou 571158, China;
    2 School of Mathematics and Computational Sciences, Hunan First Normal University, Changsha 410205, China;
    3 Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China
  • Received:2017-08-08 Revised:2017-09-11 Online:2018-01-05 Published:2018-01-05
  • Contact: Qing-Shou Tan E-mail:qingshoutan@163.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11665010), the Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, China (Grant No. QSQC1414), and the Scientific Research Fund of Hunan Provincial Education Department, China (Grant No. 17B055).

摘要:

We consider a passive and active hybrid interferometer for phase estimation, which can reach the sub-shot-noise limit in phase sensitivity with only the cheapest coherent sources. This scheme is formed by adding an optical parametric amplifier before a Mach-Zehnder interferometer. It is shown that our hybrid protocol can obtain a better quantum Cramer-Rao bound than the pure active (e.g., SU(1,1)) interferometer, and this precision can be reached by implementing the parity measurements. Furthermore, we also draw a detailed comparison between our scheme and the scheme suggested by Caves[Phys. Rev. D 23 1693 (1981)], and it is found that the optimal phase sensitivity gain obtained in our scheme is always larger than that in Caves' scheme.

关键词: phase estimation, quantum metrology

Abstract:

We consider a passive and active hybrid interferometer for phase estimation, which can reach the sub-shot-noise limit in phase sensitivity with only the cheapest coherent sources. This scheme is formed by adding an optical parametric amplifier before a Mach-Zehnder interferometer. It is shown that our hybrid protocol can obtain a better quantum Cramer-Rao bound than the pure active (e.g., SU(1,1)) interferometer, and this precision can be reached by implementing the parity measurements. Furthermore, we also draw a detailed comparison between our scheme and the scheme suggested by Caves[Phys. Rev. D 23 1693 (1981)], and it is found that the optimal phase sensitivity gain obtained in our scheme is always larger than that in Caves' scheme.

Key words: phase estimation, quantum metrology

中图分类号:  (Nonclassical interferometry, subwavelength lithography)

  • 42.50.St
42.50.Dv (Quantum state engineering and measurements)