Surpassing Quantum Noise Limits with Nonlinear Amplification
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910050387230720 |
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| author | Ren, Ya-Long Cao, Rong-Teng Ma, Sheng-Li Zhang, Ren Li, Fu-Li Nori, Franco Li, Peng-Bo |
| author_facet | Ren, Ya-Long Cao, Rong-Teng Ma, Sheng-Li Zhang, Ren Li, Fu-Li Nori, Franco Li, Peng-Bo |
| contents | Linear quantum amplifiers are indispensable tools for quantum technologies, yet their performance is fundamentally limited by quantum noise, precluding any signal-to-noise ratio (SNR) enhancement unless supplemented by post-selection or non-classical resources. To surpass this limitation, we propose a nonlinear quantum amplification strategy that exploits the interplay between a gain-stabilized bright eigenmode of a coupled two-mode bosonic system and Kerr nonlinearity. We demonstrate that this interplay enables the signal gain to surpass the noise gain in a selected quadrature, leading to a net increase in the SNR beyond the quantum limits of conventional linear amplifiers. Our work thus establishes a novel nonlinear amplification paradigm capable of enhancing the SNR, with promising applications across quantum information processing, quantum communications, and quantum metrology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_11574 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Surpassing Quantum Noise Limits with Nonlinear Amplification Ren, Ya-Long Cao, Rong-Teng Ma, Sheng-Li Zhang, Ren Li, Fu-Li Nori, Franco Li, Peng-Bo Quantum Physics Linear quantum amplifiers are indispensable tools for quantum technologies, yet their performance is fundamentally limited by quantum noise, precluding any signal-to-noise ratio (SNR) enhancement unless supplemented by post-selection or non-classical resources. To surpass this limitation, we propose a nonlinear quantum amplification strategy that exploits the interplay between a gain-stabilized bright eigenmode of a coupled two-mode bosonic system and Kerr nonlinearity. We demonstrate that this interplay enables the signal gain to surpass the noise gain in a selected quadrature, leading to a net increase in the SNR beyond the quantum limits of conventional linear amplifiers. Our work thus establishes a novel nonlinear amplification paradigm capable of enhancing the SNR, with promising applications across quantum information processing, quantum communications, and quantum metrology. |
| title | Surpassing Quantum Noise Limits with Nonlinear Amplification |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.11574 |