Published in Physical Review A: Multiple-copy state discrimination: Thinking globally, acting locally

Following on from our prior paper, here we take a closer theoretical look at the different measurement approaches one can use to discriminate between nonorthogonal quantum states when given multiple copies. We examine the behaviour of these schemes in both limits of moderate number of copies and as the number of copies tends towards infinity (the latter of which took quite a long time to determine for the overall optimal scheme), and we identify the quantum mixture regimes in which certain measurements become the same. Indeed, we show that for more than 2% mixture and a large number of copies, the naive measurement strategy is as good as any other.

B. L. Higgins, A. C. Doherty, S. D. Bartlett, G. J. Pryde, and H. M. Wiseman
Phys. Rev. A 83, 052314 (2011)

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