| SPECIAL TOPIC — Quantum communication and quantum network |
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Quantum-enhanced interferometry with unbalanced entangled coherent states |
| Jun Tang(汤俊)1, Zi-Hang Du(堵子航)1, Wei Zhong(钟伟)1,†, Lan Zhou(周澜)2, and Yu-Bo Sheng(盛宇波)3 |
1 Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
2 School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
3 College of Electronic and Optical Engineering and College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210003, China |
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Abstract We propose a quantum-enhanced metrological scheme utilizing unbalanced entangled coherent states (ECSs) generated by passing a coherent state and a coherent state superposition through an unbalanced beam splitter (BS). We identify the optimal phase sensitivity of this scheme by maximizing the quantum Fisher information (QFI) with respect to the BS transmission ratio. Our scheme outperforms the conventional scheme with a balanced BS, particularly in the presence of single-mode photon loss. Notably, our scheme retains quantum advantage in phase sensitivity in the limit of high photon intensity, where the balanced scheme offers no advantage over the classical strategy.
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Received: 11 September 2024
Revised: 13 November 2024
Accepted manuscript online: 03 December 2024
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PACS:
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03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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42.50.-p
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(Quantum optics)
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42.50.St
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(Nonclassical interferometry, subwavelength lithography)
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42.79.-e
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(Optical elements, devices, and systems)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant No. 12005106) and the Postgraduate Research and Practice Innovation Program of Jiangsu Province (Grant No. JSCX23-0260). Y. B. S. acknowledges support from the National Natural Science Foundation of China (Grant No. 11974189). L. Z. acknowledges support from the National Natural Science Foundation of China (Grant No. 12175106). |
Corresponding Authors:
Wei Zhong
E-mail: zhongwei1118@gmail.com
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Cite this article:
Jun Tang(汤俊), Zi-Hang Du(堵子航), Wei Zhong(钟伟), Lan Zhou(周澜), and Yu-Bo Sheng(盛宇波) Quantum-enhanced interferometry with unbalanced entangled coherent states 2025 Chin. Phys. B 34 020303
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