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Tao Y, Li X, Li L, Huang J, Li H, Wang T, Zhou L, Zeng G. Surpassing the Quantum Limit in Bosonic Loss Estimation without Quantum Probes. PHYSICAL REVIEW LETTERS 2024; 133:060801. [PMID: 39178437 DOI: 10.1103/physrevlett.133.060801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 05/23/2024] [Accepted: 07/02/2024] [Indexed: 08/25/2024]
Abstract
Bosonic loss estimation has an important role in quantum metrology. It was once believed that the ultimate precision of this task is restricted to the standard quantum limit if no quantum probe is involved. Nevertheless, a recent proposal showed that this limit can be surpassed by utilizing ring resonators with coherent state probe. Here, we experimentally realize the resonator-based bosonic loss estimation and verify the resonant enhancement effect. This Letter explores the advantages of resonator-based metrology and sheds light on the development of high-precision miniature sensors.
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Affiliation(s)
- Yu Tao
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xinhang Li
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Lang Li
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jingzheng Huang
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- Hefei National Laboratory, Hefei 230088, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
| | - Hongjing Li
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- Hefei National Laboratory, Hefei 230088, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
| | - Tao Wang
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- Hefei National Laboratory, Hefei 230088, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
| | - Linjie Zhou
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- SJTU-Pinghu Institute of Intelligent Optoelectronics, Pinghu, 314200, China
| | - Guihua Zeng
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- Hefei National Laboratory, Hefei 230088, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
- Shanghai XunTai Quantech Co., Ltd, Shanghai, 200241, China
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Li J, Niu Y, Wang X, Qin L, Li XQ. Quantum-coherence-free precision metrology by means of difference-signal amplification. Sci Rep 2023; 13:4688. [PMID: 36949235 PMCID: PMC10033826 DOI: 10.1038/s41598-023-31787-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Accepted: 03/17/2023] [Indexed: 03/24/2023] Open
Abstract
The novel weak-value-amplification (WVA) scheme of precision metrology is deeply rooted in the quantum nature of destructive interference between the pre- and post-selection states. And, an alternative version, termed as joint WVA (JWVA), which employs the difference-signal from the post-selection accepted and rejected results, has been found possible to achieve even better sensitivity (two orders of magnitude higher) under some technical limitations (e.g. misalignment errors). In this work, after erasing the quantum coherence, we analyze the difference-signal amplification (DSA) technique, which serves as a classical counterpart of the JWVA, and show that similar amplification effect can be achieved. We obtain a simple expression for the amplified signal, carry out characterization of precision, and point out the optimal working regime. We also discuss how to implement the post-selection of a classical mixed state. The proposed classical DSA technique holds similar technical advantages of the JWVA and may find interesting applications in practice.
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Affiliation(s)
- Jialin Li
- Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin, 300072, China
| | - Yazhi Niu
- Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin, 300072, China
| | - Xinyi Wang
- Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin, 300072, China
| | - Lupei Qin
- Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin, 300072, China.
| | - Xin-Qi Li
- Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin, 300072, China.
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