Authors

A. Parra-Rodriguez, I. L. Egusquiza

Abstract

Following a consistent geometrical description previously introduced [], we present an exact method for obtaining canonically quantizable Hamiltonian descriptions of nonlinear, nonreciprocal quasilumped electrical networks. We identify and classify singularities arising in the quest for Hamiltonian descriptions of general quasilumped element networks via the Faddeev-Jackiw technique. We offer systematic solutions to cases previously considered singular—a major challenge in the context of canonical circuit quantization. The solution relies on the correct identification of the reduced classical circuit-state manifold, i.e., a mix of flux and charge fields and functions. Starting from the geometrical description of the transmission line, we provide a complete program including lines coupled to one-port lumped-element networks, as well as multiple lines connected to multiport nonreciprocal lumped-element networks, with intrinsic ultraviolet cutoff. On the way, we naturally extend the canonical quantization of transmission lines coupled through frequency-dependent, nonreciprocal linear systems, such as practical circulators. Additionally, we demonstrate how our method seamlessly facilitates the characterization of general nonreciprocal, dissipative linear environments. This is achieved by extending the Caldeira-Leggett formalism, using continuous limits of series of immittance matrices. We provide a tool in the analysis and design of electrical circuits and of special interest in the context of canonical quantization of superconducting networks. For instance, this work provides a solid ground for a precise nondivergent input-output theory in the presence of nonreciprocal devices, e.g., within (chiral) waveguide QED platforms. Published by the American Physical Society 2025

Citation

  • Journal: Physical Review X
  • Year: 2025
  • Volume: 15
  • Issue: 1
  • Pages:
  • Publisher: American Physical Society (APS)
  • DOI: 10.1103/physrevx.15.011072

BibTeX

@article{Parra_Rodriguez_2025,
  title={{Exact Quantization of Nonreciprocal Quasilumped Electrical Networks}},
  volume={15},
  ISSN={2160-3308},
  DOI={10.1103/physrevx.15.011072},
  number={1},
  journal={Physical Review X},
  publisher={American Physical Society (APS)},
  author={Parra-Rodriguez, A. and Egusquiza, I. L.},
  year={2025}
}

Download the bib file

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