We apply a Kennedy-type detection scheme, which was originally proposed for a binary communications system, to interferometric sensing devices. We show that the minimum detectable perturbation of the proposed system reaches the ultimate precision bound which is predicted by Neyman-Pearson hypothesis testing. To provide concrete examples, we apply our interferometric scheme to phase shift detection by using coherent and squeezed probe fields.
The optimal strategy of two-photon interferometric sensing in diverse noise environments
School of Physics and Information Science, Shaanxi University of Science and Technology（陕西科技大学物理与信息科学学院）；Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University（湖南师范大学物理与协同创新中心量子效应及应用教育部低维量子结构与量子控制重点实验室）；Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology（武汉工程大学湖北省光学信息与模式识别重点实验室）
Heisenberg-scaling characterization of a two-channel optical network via two-port homodyne detection
School of Mathematics and Physics, University of Portsmouth（朴茨茅斯大学数学与物理学院）；Quantum Science and Technology Hub, University of Portsmouth（朴茨茅斯大学量子科学与技术中心）；Dipartimento di Fisica, Università di Bari & Politecnico di Bari（巴里大学与巴里理工大学物理系）；INFN, Sezione di Bari（意大利国家核物理研究所巴里分部）；Institute of Cosmology and Gravitation, University of Portsmouth（朴茨茅斯大学宇宙学与引力研究所）
On-chip semi-device-independent quantum random number generator exploiting contextuality
Technical University of Denmark（丹麦技术大学）；Queen Mary University of London（伦敦大学玛丽女王学院）；IHP – Leibniz-Institut für innovative Mikroelektronik（IHP – 莱布尼茨创新微电子研究所）；Technische Universität Berlin（柏林工业大学）；University of Florence（佛罗伦萨大学）；QTI s.r.l.（QTI有限公司）
