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Quantum precision measurement of super Heisenberg limit and Heisenberg limit: China has achieved it at the same time

via:驱动之家     time:2021/2/24 2:10:29     readed:88

According to the information from the University of science and technology of China, Li Chuanfeng, Xiang Guoyong and Professor Yuan Haidong of the Chinese University of Hong Kong, the research team of academician Guo guangcan of the University, together with Professor Yuan Haidong of the Chinese University of Hong Kong, conducted the quantum precision measurement experiment,

It is reported that the precision of precision measurement will be improved with the increase of consumed resources. Mathematically, it is described by t-k, where t is the resource (such as measurement time) and K is the most important standard precision growth order to evaluate the advantages and disadvantages of different measurement methods.

In many applications such as phase estimation, magnetometer and quantum gyroscope, it is found that K is 0.5 and 1 respectively in classical measurement method and quantum measurement method, which are called shot noise limit and Heisenberg limit respectively.


This achievement strengthens the connection between quantum precision measurement and Heisenberg uncertainty relation, promotes the cross development of these two fields, and has important potential application value in practical measurement problems.

The research results were published in the international well-known journal Physical Review Letters on February 18, 2021.

Multi parameter estimation is not only an important problem in quantum precision measurement, but also has a wide range of applications. I think this is a solid work with enough novelty and value, which is worth publishing in PRL.

The research was supported by the Ministry of science and technology, the National Natural Science Foundation of China, the Chinese Academy of Sciences and the Ministry of education.



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