中国物理B ›› 2019, Vol. 28 ›› Issue (9): 94217-094217.doi: 10.1088/1674-1056/ab38a9

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

Quantum optical interferometry via general photon-subtracted two-mode squeezed states

Li-Li Hou(侯丽丽), Jian-Zhong Xue(薛建忠), Yong-Xing Sui(眭永兴), Shuai Wang(王帅)   

  1. School of Mathematics and Physics, Jiangsu University of Technology, Changzhou 213001, China
  • 收稿日期:2019-05-18 修回日期:2019-06-29 出版日期:2019-09-05 发布日期:2019-09-05
  • 通讯作者: Shuai Wang E-mail:wshslxy@jsut.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11404040) and the Qing Lan Project of the Higher Educations of Jiangsu Province of China.

Quantum optical interferometry via general photon-subtracted two-mode squeezed states

Li-Li Hou(侯丽丽), Jian-Zhong Xue(薛建忠), Yong-Xing Sui(眭永兴), Shuai Wang(王帅)   

  1. School of Mathematics and Physics, Jiangsu University of Technology, Changzhou 213001, China
  • Received:2019-05-18 Revised:2019-06-29 Online:2019-09-05 Published:2019-09-05
  • Contact: Shuai Wang E-mail:wshslxy@jsut.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11404040) and the Qing Lan Project of the Higher Educations of Jiangsu Province of China.

摘要:

We investigate the sensitivity of phase estimation in a Mach-Zehnder interferometer with photon-subtracted two-mode squeezed vacuum states. Our results show that, for given initial squeezing parameter, both symmetric and asymmetric photon subtractions can further improve the quantum Cramér-Rao bound (i.e., the ultimate phase sensitivity), especially for single-mode photon subtraction. On the other hand, the quantum Cramér-Rao bound can be reached by parity detection for symmetric photon-subtracted two-mode squeezed vacuum states at particular values of the phase shift, but it is not valid for asymmetric photon-subtracted two-mode squeezed vacuum states. In addition, compared with the two-mode squeezed vacuum state, the phase sensitivity via parity detection with asymmetric photon-subtracted two-mode squeezed vacuum states will be getting worse. Thus, parity detection may not always be the optimal detection scheme for nonclassical states of light when they are considered as the interferometer states.

关键词: quantum optics, phase sensitivity, quantum metrology

Abstract:

We investigate the sensitivity of phase estimation in a Mach-Zehnder interferometer with photon-subtracted two-mode squeezed vacuum states. Our results show that, for given initial squeezing parameter, both symmetric and asymmetric photon subtractions can further improve the quantum Cramér-Rao bound (i.e., the ultimate phase sensitivity), especially for single-mode photon subtraction. On the other hand, the quantum Cramér-Rao bound can be reached by parity detection for symmetric photon-subtracted two-mode squeezed vacuum states at particular values of the phase shift, but it is not valid for asymmetric photon-subtracted two-mode squeezed vacuum states. In addition, compared with the two-mode squeezed vacuum state, the phase sensitivity via parity detection with asymmetric photon-subtracted two-mode squeezed vacuum states will be getting worse. Thus, parity detection may not always be the optimal detection scheme for nonclassical states of light when they are considered as the interferometer states.

Key words: quantum optics, phase sensitivity, quantum metrology

中图分类号:  (Quantum state engineering and measurements)

  • 42.50.Dv
03.65.Ta (Foundations of quantum mechanics; measurement theory)