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 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
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 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
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.
中图分类号: (Nonclassical interferometry, subwavelength lithography)
- 42.50.St