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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 |
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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.
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Received: 08 August 2017
Revised: 11 September 2017
Accepted manuscript online:
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PACS:
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42.50.St
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(Nonclassical interferometry, subwavelength lithography)
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42.50.Dv
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(Quantum state engineering and measurements)
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| Fund: 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). |
Corresponding Authors:
Qing-Shou Tan
E-mail: qingshoutan@163.com
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Cite this article:
Lan Xu(许兰), Qing-Shou Tan(谭庆收) Super-sensitive phase estimation with coherent boosted light using parity measurements 2018 Chin. Phys. B 27 014203
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