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Full-field mode sorter using two optimized phase transformations for high-dimensional quantum cryptography

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Article number024001
Number of pages7
JournalJournal of Optics (United Kingdom)
Issue number2
Publication statusPublished - 2020
Publication typeA1 Journal article-refereed


High-dimensional encoding schemes have emerged as a novel way to perform quantum information tasks. For high dimensionality, temporal and transverse spatial modes of photons are the two paradigmatic degrees of freedom commonly used in such experiments. Nevertheless, general devices for multi-outcome measurements are still needed to take full advantage of the high-dimensional nature of encoding schemes. We propose a general full-field mode sorting scheme consisting of only up to two optimized phase elements based on evolutionary algorithms that allows for joint sorting of azimuthal and radial modes. We further study the performance of our scheme through simulations in the context of high-dimensional quantum cryptography, where sorting in different mutually unbiased bases and high-fidelity measurement schemes are crucial.


  • mode demultiplexing high-dimensional quantum information, quantum cryptography, transverse spatial modes

Publication forum classification

Field of science, Statistics Finland