Resonance fluorescence of an artificial atom with a time-delayed coherent feedback
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914431469879296 |
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| author | Chen, Ching-Yeh Crowder, Gavin Niu, Zheng-Qi Wen, Ping Yi Lin, Yen-Hsiang Chen, Jeng-Chung Lin, Zhi-Rong Nori, Franco Hughes, Stephen Hoi, Io-Chun |
| author_facet | Chen, Ching-Yeh Crowder, Gavin Niu, Zheng-Qi Wen, Ping Yi Lin, Yen-Hsiang Chen, Jeng-Chung Lin, Zhi-Rong Nori, Franco Hughes, Stephen Hoi, Io-Chun |
| contents | The model of light-matter interaction in quantum electrodynamics typically relies on the Markovian approximation, which assumes that the system's future evolution depends solely on its current state, effectively treating it as a ``memoryless" process. However, this approximation is not valid in scenarios when retardation effects are significant. These memory and retardation effects have the potential to improve existing quantum technologies (e.g., large-scale quantum networks, quantum information processing) and unlock new phenomena for future applications. In this work, we show theory and experiments of a time-delayed coherent feedback system using a transmon artificial atom (treated as a qubit) embedded in a superconducting circuit waveguide, in both linear and nonlinear excitation regimes. By using a feedback loop with a delay time comparable to the qubit relaxation time, pronounced non-Markovian effects appear in the dynamics of the qubit evolution. We also show how the resonance fluorescence spectrum, including elastic and inelastic scattering (such as the well-known Mollow triplet), can be significantly modified through the interaction between the qubit and feedback loop to show genuine non-Markovian and quantum nonlinear phenomena that cannot be explained with instantaneous coupling parameters. This work presents the first experimental report of Mollow triplets in the non-Markovian regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_28004 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Resonance fluorescence of an artificial atom with a time-delayed coherent feedback Chen, Ching-Yeh Crowder, Gavin Niu, Zheng-Qi Wen, Ping Yi Lin, Yen-Hsiang Chen, Jeng-Chung Lin, Zhi-Rong Nori, Franco Hughes, Stephen Hoi, Io-Chun Quantum Physics The model of light-matter interaction in quantum electrodynamics typically relies on the Markovian approximation, which assumes that the system's future evolution depends solely on its current state, effectively treating it as a ``memoryless" process. However, this approximation is not valid in scenarios when retardation effects are significant. These memory and retardation effects have the potential to improve existing quantum technologies (e.g., large-scale quantum networks, quantum information processing) and unlock new phenomena for future applications. In this work, we show theory and experiments of a time-delayed coherent feedback system using a transmon artificial atom (treated as a qubit) embedded in a superconducting circuit waveguide, in both linear and nonlinear excitation regimes. By using a feedback loop with a delay time comparable to the qubit relaxation time, pronounced non-Markovian effects appear in the dynamics of the qubit evolution. We also show how the resonance fluorescence spectrum, including elastic and inelastic scattering (such as the well-known Mollow triplet), can be significantly modified through the interaction between the qubit and feedback loop to show genuine non-Markovian and quantum nonlinear phenomena that cannot be explained with instantaneous coupling parameters. This work presents the first experimental report of Mollow triplets in the non-Markovian regime. |
| title | Resonance fluorescence of an artificial atom with a time-delayed coherent feedback |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.28004 |