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10 October 2020 Quantum collective measurement
Guoyong Xiang
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Proceedings Volume 11558, Quantum and Nonlinear Optics VII; 115580D (2020) https://doi.org/10.1117/12.2575258
Event: SPIE/COS Photonics Asia, 2020, Online Only
Abstract
Quantum measurement is inevitable to extract information from quantum systems. Exploring the power and limitation of quantum measurement has profound implications not only to foundational studies, but also to many practical applications. In most of these tasks, many identically prepared quantum systems are measured to acquire sufficient information. Although there is no entanglement or even no classical correlation among these identically systems, surprisingly, quantum collective measurements on them may extract more information than local measurements on individual systems, thereby leading to higher efficiency and precision in these tasks. Although the significance of collective measurements has been recognized for two decades, it is still very challenging to demonstrate their advantage in experiments. Here, we will introduce the first implementation of quantum collective measurement and it's applications on quantum orienting, reducing quantum backation of measurement, and so on.
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Guoyong Xiang "Quantum collective measurement", Proc. SPIE 11558, Quantum and Nonlinear Optics VII, 115580D (10 October 2020); https://doi.org/10.1117/12.2575258
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KEYWORDS
Quantum information
Quantum efficiency
Tomography
Metrology
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