Canonical quantisation of telegrapher's equations coupled by ideal nonreciprocal elements

Abstract

We develop a systematic procedure to quantise canonically Hamiltonians of light-matter models of transmission lines coupled through lumped linear lossless ideal nonreciprocal elements, that break time-reversal symmetry, in a circuit QED set-up. 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.

17 pages, 4 figures

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Cited by in corpus (8)

• Symplectic geometry and circuit quantization
• Geometrical description and Faddeev-Jackiw quantization of electrical networks
• Algebraic canonical quantization of lumped superconducting networks
• Quantum Fluctuations in Electrical Multiport Linear Systems
• Exact quantization of nonreciprocal quasi-lumped electrical networks
• Flux-charge symmetric theory of superconducting circuits
• Holography of Transmission Lines: Insights of Continuous MERA and AdS/CFT
• Microwave Circulation in an Extended Josephson Junction Ring