期刊
PHYSICAL REVIEW LETTERS
卷 119, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.130504
关键词
-
资金
- Ministero dell'Istruzioni, dell'Universita e della Ricerca (MIUR)
- European Research Council (ERC) Starting Grant 3DQUEST (3D-Quantum Integrated Optical Simulation) [307783]
- Horizon H2020-FETPROACT QUCHIP (Quantum Simulation on a Photonic Chip) [641039]
- Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom [EP/K04057X/2]
- United Kingdom National Quantum Technologies Program [EP/M01326X/1, EP/M013243/1]
- EPSRC [EP/K04057X/2, EP/M01326X/1, EP/M013243/1, EP/K04057X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K04057X/2, EP/K04057X/1, EP/M01326X/1, EP/M013243/1] Funding Source: researchfish
A quantum theory of multiphase estimation is crucial for quantum-enhanced sensing and imaging and may link quantum metrology to more complex quantum computation and communication protocols. In this Letter, we tackle one of the key difficulties of multiphase estimation: obtaining a measurement which saturates the fundamental sensitivity bounds. We derive necessary and sufficient conditions for projective measurements acting on pure states to saturate the ultimate theoretical bound on precision given by the quantum Fisher information matrix. We apply our theory to the specific example of interferometric phase estimation using photon number measurements, a convenient choice in the laboratory. Our results thus introduce concepts and methods relevant to the future theoretical and experimental development of multiparameter estimation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据