Physics – Quantum Physics
Scientific paper
2002-08-05
Journal of Physics A: Mathematical and General, Vol.35, No.50, pp.10759-10773 (2002).
Physics
Quantum Physics
LaTeX with iopart.cls, iopart12.clo, iopams.sty This paper is heavily reviesed
Scientific paper
10.1088/0305-4470/35/50/307
We derive a necessary and sufficient condition for a sequence of quantum measurements to achieve the optimal performance in quantum hypothesis testing. Using an information-spectrum method, we discuss what quantum measurement we should perform in order to attain the optimal exponent of the second error probability under the condition that the first error probability goes to 0. As an asymptotically optimal measurement, we propose a projection measurement characterized by the irreducible representation theory of the special linear group SL(H). Specially, in spin 1/2 system, it is realized by the simultaneous measurement of the total momentum and a momentum of a specified direction. As a byproduct, we obtain another proof of quantum Stein's lemma.
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