Optimum detection for extracting maximum information from symmetric qubit sets

Jun Mizuno, Mikio Fujiwara, Makoto Akiba, Tetsuya Kawanishi, Stephen M. Barnett, Masahide Sasaki

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26 Citations (Scopus)
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We demonstrate a class of optimum detection strategies for extracting the maximum information from sets of equiprobable real symmetric qubit states of a single photon. These optimum strategies have been predicted by Sasaki et al. [Phys. Rev. A 59, 3325 (1999)]. The peculiar aspect is that the detections with at least three outputs suffice for optimum extraction of information regardless of the number of signal elements. The cases of ternary (or trine), quinary, and septenary polarization signals are studied where a standard von Neumann detection (a projection onto a binary orthogonal basis) fails to access the maximum information. Our experiments demonstrate that it is possible with present technologies to attain about 96% of the theoretical limit.
Original languageEnglish
Article number012315
Number of pages10
JournalPhysical Review A
Issue number1
Publication statusPublished - 12 Dec 2001


  • symmetric qubit sets
  • detection strategies
  • photons
  • von Neumann
  • optical physics
  • optics


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