Jiang, T., Zhao, Z., Kang, Q., Zhao, T., Zhou, N., Liu, C., & Hu, L. (2024). Phase sensitivity for an SU(1,1) interferometer via multiphoton subtraction at the output port. arXiv preprint arXiv:2410.17612.
This research paper investigates the potential of multiphoton subtraction at the output port of an SU(1,1) interferometer to enhance phase sensitivity, particularly under realistic conditions involving photon loss.
The authors employ a theoretical framework based on quantum optics and quantum metrology. They model an SU(1,1) interferometer with vacuum and coherent state inputs, incorporating photon loss mechanisms. The phase sensitivity is calculated using the error propagation formula and compared to theoretical limits like the standard quantum limit (SQL), Heisenberg limit (HL), and quantum Cramér-Rao bound (QCRB). The impact of multiphoton subtraction on the quantum Fisher information (QFI) is also analyzed.
The study demonstrates that multiphoton subtraction is a powerful technique for enhancing the phase sensitivity of SU(1,1) interferometers, particularly in practical scenarios involving photon loss. This finding has significant implications for advancing quantum precision measurement applications.
This research contributes to the field of quantum metrology by providing a theoretical basis for improving the accuracy and sensitivity of phase estimation using SU(1,1) interferometers. The proposed scheme offers a practical approach to overcome the limitations imposed by photon loss, paving the way for more precise quantum sensing and metrology applications.
The study primarily focuses on a theoretical analysis. Experimental validation of the proposed scheme is crucial for confirming its practical feasibility and effectiveness. Further research could explore the impact of different input states, noise models, and experimental imperfections on the performance of the multiphoton subtraction scheme.
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by Tao Jiang, Z... at arxiv.org 10-24-2024
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