Giant atoms coupled to waveguide: Continuous coupling and multiple excitations

• URL: http://arxiv.org/abs/2602.15389v1
• Date: Tue, 17 Feb 2026 06:57:32 GMT
• Title: Giant atoms coupled to waveguide: Continuous coupling and multiple excitations
• Authors: Shiying Lin, Xinyu Zhao, Yan Xia,
• Abstract summary: We propose a Schrdinger equation (SSE) approach to investigate the dynamics of giant atoms coupled to a waveguide.<n>A key finding is that continuous coupling, unlike discrete coupling at finite points, breaks the constant phase difference condition.<n>The SSE approach also naturally handles multiple excitations, without increasing equation complexity as the number of excitations grows.
• Score: 14.658771343353557
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We propose a stochastic Schrödinger equation (SSE) approach to investigate the dynamics of giant atoms coupled to a waveguide, addressing two critical gaps in existing research, namely insufficient exploration on continuous coupling and multiple excitations. A key finding is that continuous coupling, unlike discrete coupling at finite points, breaks the constant phase difference condition, thereby weakening the interference effects in giant atom-waveguide systems. In addition, a key technical advantage of the SSE approach is that auto- and cross-correlation functions can directly reflect the complex photon emission/absorption processes and time-delay effects in giant atom-waveguide systems. Moreover, the SSE approach also naturally handles multiple excitations, without increasing equation complexity as the number of excitations grows. This feature enables the investigation of multi-excitation initial states of the waveguide, such as thermal and squeezed initial states. Overall, our approach provides a powerful tool for studying the dynamics of giant atoms coupled to waveguide, particularly for continuous coupling and multi-excitation systems.

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