Pseudomode approach to Fano effect in dissipative cavity quantum electrodynamics

• URL: http://arxiv.org/abs/2601.10087v1
• Date: Thu, 15 Jan 2026 05:26:14 GMT
• Title: Pseudomode approach to Fano effect in dissipative cavity quantum electrodynamics
• Authors: Kazuki Kobayashi, Tatsuro Yuge,
• Abstract summary: We study the Fano effect in dissipative cavity quantum electrodynamics.<n>The effect originates from the interference between the emitter's direct radiation and that mediated by a cavity mode.<n>Our results establish a unified framework for describing the Fano effect in single-mode cavity QED systems.
• Score: 0.42970700836450476
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the Fano effect in dissipative cavity quantum electrodynamics, which originates from the interference between the emitter's direct radiation and that mediated by a cavity mode. Starting from a two-level system coupled to a structured reservoir, we show that a quantum master equation previously derived within the Born-Markov approximation can be rederived by introducing a single auxiliary mode via pseudomode approach. We identify the corresponding spectral function of the system--environment interaction and demonstrate that it consists of a constant and a non-Lorentzian contribution forming the Fano profile. The constant term is shown to be essential for obtaining a Lindblad master equation and is directly related to the rate associated with this Fano interference. Furthermore, by applying Fano diagonalization to a common-environment setup including an explicit cavity mode, we independently derive the same spectral function in the strongest-interference regime. Our results establish a unified framework for describing the Fano effect in single-mode cavity QED systems and clarify its non-Markovian origin encoded in the spectral function.

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