Surpassing Quantum Noise Limits with Nonlinear Amplification

• URL: http://arxiv.org/abs/2603.11574v1
• Date: Thu, 12 Mar 2026 05:59:24 GMT
• Title: Surpassing Quantum Noise Limits with Nonlinear Amplification
• Abstract summary: nonlinear quantum amplification strategy exploits interplay between a gain-stabilized bright eigenmode of a coupled two-mode bosonic system and Kerr nonlinearity.<n>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.
• Score: 2.8695564948732692
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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