Programmable linear quantum networks with a multimode fibre

Saroch Leedumrongwatthanakun, Luca Innocenti , Hugo Defienne, Thomas Juffmann, A. Ferraro, Mauro Paternostro, Sylvain Gigan (Corresponding author)

Publications: Contribution to journalShort communicationPeer Reviewed


Reconfigurable quantum circuits are fundamental building blocks for the implementation of scalable quantum technologies. Their implementation has been pursued in linear optics through the engineering of sophisticated interferometers1,2,3. Although such optical networks have been successful in demonstrating the control of small-scale quantum circuits, scaling up to larger dimensions poses significant challenges4,5. Here, we demonstrate a potentially scalable route towards reconfigurable optical networks based on the use of a multimode fibre and advanced wavefront shaping techniques. We program networks involving spatial and polarization modes of the fibre and experimentally validate the accuracy and robustness of our approach using two-photon quantum states. In particular, we illustrate the reconfigurability of our platform by emulating a tunable coherent absorption experiment6. By demonstrating reliable reprogrammable linear transformations, with the prospect to scale, our results highlight the potential of complex media driven by wavefront shaping for quantum information processing.
Original languageEnglish
Pages (from-to)139–142
Number of pages4
JournalNature Photonics
Issue number3
Early online date2 Dec 2019
Publication statusPublished - Mar 2020

Austrian Fields of Science 2012

  • 103026 Quantum optics
  • 103021 Optics



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