Enhanced Phase Estimation via Photon-Added Two-Mode Squeezed States and Kerr Nonlinearity

• URL: http://arxiv.org/abs/2602.00700v1
• Date: Sat, 31 Jan 2026 12:52:26 GMT
• Title: Enhanced Phase Estimation via Photon-Added Two-Mode Squeezed States and Kerr Nonlinearity
• Authors: Zekun Zhao, Qingqian Kang, Teng Zhao, Cunjin Liu, Liyun Hu,
• Abstract summary: This work investigates a Mach-Zehnder interferometer incorporating a Kerr nonlinear phase shifter.<n>The proposed scheme exhibits enhanced robustness against photon loss, providing a promising approach for high-precision quantum metrology applications.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum metrology harnesses quantum resources to achieve measurement precision beyond classical limits. This work investigates a Mach-Zehnder interferometer incorporating a Kerr nonlinear phase shifter, using photon-added two-mode squeezed coherent states generated via four-wave mixing as input. This study demonstrates that increasing both the photon-addition order and input resource strength systematically enhances phase sensitivity, quantum Fisher information, and the quantum Cramér-Rao bound. The system not only surpasses the standard quantum limit but also approaches or exceeds the Heisenberg limit with linear phase shifts, while Kerr nonlinearity enables overcoming the super-Heisenberg limit. The proposed scheme exhibits enhanced robustness against photon loss, providing a promising approach for high-precision quantum metrology applications.

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