China News Service, Hangzhou, April 28 (Xie Panpan, Cheng Zhenwei, Zhang Zhiyuan) On April 28, the reporter learned from Hangzhou Dianzi University that Professor Lu Xiaoming, director of the quantum precision measurement laboratory of the school, and Professor Wang Xiaoguang of the Department of Physics, Zhejiang University , Published an article in a journal in the field of physics, for the first time that Heisenberg's uncertainty principle and quantum multi-parameter estimation are directly combined, and a new type of information restriction relationship is proposed, which can successfully draw the "best measurement curve that takes into account multiple parameters." .
This means that "the study of quantum precision measurement of multiple signal parameters has obtained new key theoretical tools."
As we all know, quantum information technology mainly includes three major areas: quantum computing, quantum communication, and quantum precision measurement. It can break through the bottleneck of classical technology in terms of increasing processing speed, information security capability, measurement accuracy and sensitivity.
The picture shows the content of related papers.
Provided by Zhang Zhiyuan
In recent years, quantum precision measurement has been highly anticipated in aspects such as gravitational wave observation.
However, quantum precision measurement also has an "Achilles' heel."
According to Heisenberg's uncertainty principle, for some physical quantities, it is impossible for us to accurately measure them at the same time.
For example, for a particle, we can make the best measurement of its position, and we can also make the best measurement of its momentum.
However, it is impossible to optimally measure its position and momentum at the same time.
How to quantitatively describe the restriction relationship is an unsolved problem in multi-parameter quantum precision measurement for a long time.
Professor Lu Xiaoming, Director of the Quantum Precision Measurement Laboratory of Hangzhou Dianzi University, and Professor Wang Xiaoguang of the Department of Physics of Zhejiang University, published an article on the top international journal in the field of physics "Physical Review Letters", the first time Heisenberg was inaccurate The principle and quantum multi-parameter estimation are directly combined, and a new type of information restriction relationship is proposed.
Using this new type of control relationship, it is possible to successfully draw the "best measurement curve that takes into account multiple parameters" in many problems.
This means that "the study of quantum precision measurement of multiple signal parameters has obtained new key theoretical tools."
"This paper defines a kind of'information regret', which is used to quantitatively describe the performance gap of quantum measurement in estimating unknown parameters compared with the best case. Further, based on the information regret, those when multiple parameters are measured at the same time can be derived. The'best combination'. For example, the'quantum' classmate wants to find a job that'less things' and'close to home', but often can't have both. When the classmate has received some employment notices, he will hesitate to find a job There are better opportunities. But based on the method of this paper, we can tell this "quantum" classmate a series of best combinations (ie, "as little as possible" as close to home as possible")." Lu Xiaoming told reporters.
In order to visualize the Heisenberg Uncertainty Principle, "multi-parameter measurement accuracy cannot be achieved with a bear's paw", Lu Xiaoming likened it to "it is impossible to be a hundred percent clairvoyant and a hundred percent smooth ear."
The "best measurement curve that takes into account multiple parameters" drawn in the paper is equivalent to finding a measurement area that "sees farther and hears clearly" and "plays all potential".
It is understood that this research was supported by funding from the National Natural Science Foundation of China and the Zhejiang Natural Science Foundation.
In recent years, the team led by Professor Lu Xiaoming has completed the preliminary construction of the quantum precision measurement laboratory, and has made many important progress in quantum imaging and other aspects. It has been published in npj Quantum Information, Physical Review A, Physical Review Applied and other well-known physical journals. Published many important research results.
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