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This is achieved through a description of the distributed subsystems in terms of both flux and charge fields. We prove that this apparent redundancy is required for the general derivation of the Hamiltonian for a wider class of networks. By making use of the electromagnetic duality symmetry in transmission lines (waveguides), we provide unambiguous identification of the physical degrees of freedom, separating out the nondynamical parts. This doubled description can also treat the case of other extended lumped interactions in a regular manner that presents no spurious divergences, as we show explicitly in the example of a circulator connected to a Josephson junction through a transmission line. This theory enhances the quantum engineering toolbox to design complex networks with nonreciprocal elements.<\/jats:p>","DOI":"10.22331\/q-2022-04-04-681","type":"journal-article","created":{"date-parts":[[2022,4,4]],"date-time":"2022-04-04T15:51:53Z","timestamp":1649087513000},"page":"681","update-policy":"https:\/\/doi.org\/10.22331\/q-crossmark-policy-page","source":"Crossref","is-referenced-by-count":12,"title":["Canonical quantisation of telegrapher&amp;apos;s equations coupled by ideal nonreciprocal elements"],"prefix":"10.22331","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0896-9452","authenticated-orcid":false,"given":"Adrian","family":"Parra-Rodriguez","sequence":"first","affiliation":[{"name":"Department of Physics, University of the Basque Country UPV\/EHU, Apartado 644, 48080 Bilbao, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5827-8027","authenticated-orcid":false,"given":"I\u00f1igo L.","family":"Egusquiza","sequence":"additional","affiliation":[{"name":"Department of Physics, University of the Basque Country UPV\/EHU, Apartado 644, 48080 Bilbao, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"9598","published-online":{"date-parts":[[2022,4,4]]},"reference":[{"key":"0","doi-asserted-by":"publisher","unstructured":"M. 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