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Chin. Phys. B, 2016, Vol. 25(4): 040601    DOI: 10.1088/1674-1056/25/4/040601
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Phase sensitivity of two nonlinear interferometers with inputting entangled coherent states

Chao-Ping Wei(魏朝平), Xiao-Yu Hu(胡小玉), Ya-Fei Yu(於亚飞), Zhi-Ming Zhang(张智明)
Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices (SIPSE), and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China
Abstract  We investigate the phase sensitivity of the SU(1,1) interfereometer [SU(1,1)I] and the modified Mach-Zehnder interferometer (MMZI) with the entangled coherent states (ECS) as inputs. We consider the ideal case and the situations in which the photon losses are taken into account. We find that, under ideal conditions, the phase sensitivity of both the MMZI and the SU(1,1)I can beat the shot-noise limit (SNL) and approach the Heisenberg limit (HL). In the presence of photon losses, the ECS can beat the coherent and squeezed states as inputs in the SU(1,1)I, and the MMZI is more robust against internal photon losses than the SU(1,1)I.
Keywords:  quantum optics      phase sensitivity      quantum metrology  
Received:  02 December 2015      Revised:  29 December 2015      Accepted manuscript online: 
PACS:  06.20.-f (Metrology)  
  42.50.-p (Quantum optics)  
  42.50.Dv (Quantum state engineering and measurements)  
Fund: Project supported by the Major Research Plan of the National Natural Science Foundation of China (Grant No. 91121023), the National Natural Science Foundation of China (Grant Nos. 11574092, 61378012, and 60978009), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20124407110009), the National Basic Research Program of China (Grant Nos. 2011CBA00200 and 2013CB921804), and the Program for Innovative Research Team in University (Grant No. IRT1243).
Corresponding Authors:  Zhi-Ming Zhang     E-mail:

Cite this article: 

Chao-Ping Wei(魏朝平), Xiao-Yu Hu(胡小玉), Ya-Fei Yu(於亚飞), Zhi-Ming Zhang(张智明) Phase sensitivity of two nonlinear interferometers with inputting entangled coherent states 2016 Chin. Phys. B 25 040601

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