@misc{indiciae3b922f82ff04,
  title = {Optical filter architecture for approximating any 2 X 2 unitary matrix.},
  author = {C K Madsen and P Oswald},
  year = {2003},
  doi = {10.1364/ol.28.000534},
  url = {https://pubmed.ncbi.nlm.nih.gov/12696607/},
  note = {Source identifier: 12696607}
}