Unambiguous state discrimination in high dimensions

S. Franke-Arnold, J. Jeffers

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We propose methods for the unambiguous discrimination of quantum states encoded in the spatial profile of light modes, in particular in the orbital angular momentum of light. Perfect discrimination between quantum states is possible only between orthogonal states of a known basis system. Generalised measurement strategies have been developed for the distinction between non-orthogonal states in a two-dimensional state space, e. g. the polarisation of light. Here we consider information encoded in superpositions of orbital angular momentum states of light, defined within an infinite-dimensional state space. Generalised measurements will be an important addition to quantum communication in high-dimensional spaces.

Original languageEnglish
Article number196
Pages (from-to)-
Number of pages4
JournalEuropean Physical Journal D: Atomic, Molecular, Optical and Plasma Physics
Issue number7
Publication statusPublished - Jul 2012


  • quantum states
  • orbital angular momentum
  • light
  • polarisation


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