Phase estimation via coherent and photon-catalyzed squeezed vacuum states

• DOI: 10.48550/arxiv.2403.15761
• Publication Date: 2024-03-23
• Authors: Zekun Zhao; Qingqian Kang; Huan Zhang; Teng Zhao; Cunjin Liu; Li-Yun Hu
• Keywords: Quantum Physics; 0103 physical sciences; FOS: Physical sciences; Quantum Physics (quant-ph); 01 natural sciences

The research focused on enhancing the measurement accuracy through use of non-Gaussian states has garnered increasing attention. In this study, we propose a scheme to input coherent state mixed with photon-catalyzed squeezed vacuum into Mach-Zender interferometer enhance phase accuracy. findings demonstrate that photon catalysis, particularly multi-photon can effectively improve sensitivity parity detection and quantum Fisher information. Moreover, situation losses in practical was studied. results indicate external dissipation greater influence than internal dissipation. Compared state, utilization catalyzed as input, Furthermore, exceed standard limit, even surpass Heisenberg limit. This is expected significantly contribute precision measurement.