Abstract
The effects of different quantum feedback types on the estimation precision of the detection efficiency are studied. It is found that the precision can be more effective enhanced by a certain feedback type through comparing these feedbacks and the precision has a positive relation with detection efficiency for the optimal feedback when the system reach the state of dynamic balance. In addition, the bigger the proportion of |1〉 is the higher the precision is and we will not obtain any information about the parameter to be estimated if |0〉 is chosen as initial state for the feedback type λσz.
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