Journal
IEEE TRANSACTIONS ON INFORMATION THEORY
Volume 54, Issue 11, Pages 5172-5185Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIT.2008.929940
Keywords
Heisenberg limit; parameter estimation; programmable gates; quantum channels; standard quantum limit
Funding
- National Natural Science Foundation of China [60503001, 60421001, 60621062]
- Hi-Tech Research and Development Program of China [2006AA01Z102]
- FANEDD [200755]
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The efficiency of parameter estimation of quantum channels is studied in this paper. We introduce the concept of programmable parameters to the theory of estimation. It is found that programmable parameters obey the standard quantum limit strictly; hence, no speedup is possible in its estimation. We also construct a class of nonunitary quantum channels whose parameter can be estimated in a way that the standard quantum limit is broken. The study of estimation of general quantum channels also enables an investigation of the effect of noises on quantum estimation.
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