Elsevier

Physics Letters A

Volume 303, Issues 2–3, 14 October 2002, Pages 140-146
Physics Letters A

Upper bound on the success probability for unambiguous discrimination

https://doi.org/10.1016/S0375-9601(02)01236-7Get rights and content

Abstract

With generalized measurement transformations, we derive an upper bound on the success probability for unambiguous discrimination among n states with respective a priori probabilities, which improves the existing bound in the literature. Interestingly, by exploiting the no-signaling condition independent of any measurement transformation, we can also obtain the same bound as above.

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Acknowledgements

I am grateful to the anonymous referee for valuable comments and suggestions. Thanks are also to those comrades in the seminar of quantum computation. This work was supported by the National Key Project for Basic Research and the Natural Science Foundation of Guangdong Province (Grant No. 020146) of China.

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