Quantum-enhanced interferometry with unbalanced entangled coherent states

doi:10.1088/1674-1056/ad99ca

中国物理B ›› 2025, Vol. 34 ›› Issue (2): 20303-020303.doi: 10.1088/1674-1056/ad99ca

所属专题： SPECIAL TOPIC — Quantum communication and quantum network

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

收稿日期:2024-09-11 修回日期:2024-11-13 接受日期:2024-12-03 出版日期:2025-02-15 发布日期:2025-01-15
通讯作者: Wei Zhong E-mail:zhongwei1118@gmail.com
基金资助:
We thank Chun-Mei Zhang for helpful discussions. 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).

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

Received:2024-09-11 Revised:2024-11-13 Accepted:2024-12-03 Online:2025-02-15 Published:2025-01-15
Contact: Wei Zhong E-mail:zhongwei1118@gmail.com
Supported by:
We thank Chun-Mei Zhang for helpful discussions. 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).

摘要/Abstract

摘要： 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.

关键词: quantum-enhanced interferometry, entangled coherent state, quantum Fisher information

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.

Key words: quantum-enhanced interferometry, entangled coherent state, quantum Fisher information

中图分类号: (Foundations of quantum mechanics; measurement theory)

03.65.Ta

42.50.-p (Quantum optics) 42.50.St (Nonclassical interferometry, subwavelength lithography) 42.79.-e (Optical elements, devices, and systems)

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[J]. 中国物理B, 2025, 34(2): 20303-020303.

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[J]. Chin. Phys. B, 2025, 34(2): 20303-020303.

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Quantum-enhanced interferometry with unbalanced entangled coherent states

Quantum-enhanced interferometry with unbalanced entangled coherent states

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