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| Autori principali: | , , , |
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| Natura: | Preprint |
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2026
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| Accesso online: | https://arxiv.org/abs/2604.05047 |
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| _version_ | 1866908941045202944 |
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| author | Vijaywargia, Bidhi Chávez-Carlos, Jorge Pérez-Bernal, Francisco Santos, Lea F. |
| author_facet | Vijaywargia, Bidhi Chávez-Carlos, Jorge Pérez-Bernal, Francisco Santos, Lea F. |
| contents | Dynamical instabilities can amplify small perturbations into measurable signals, offering a route to quantum-enhanced sensing. This mechanism was experimentally demonstrated in a collective-spin system with quadratic interactions, described by a twisting-and-turning Hamiltonian, where quantum evolution near an unstable point leads to exponential growth of spin fluctuations, enabling metrological gain beyond the standard quantum limit. Here, we show that a quartic extension of this Hamiltonian substantially increases the amplification. The additional nonlinear term reshapes the phase-space structure, generating new unstable points and accelerating signal amplification. As a result, enhanced sensitivity is achieved within experimentally accessible coherence times. Remarkably, even at fixed instability rate (equal Lyapunov exponent), multibody interactions outperform the quadratic case due to enhanced short-time dynamics. We analyze the classical and quantum behavior of the multibody model and discuss its experimental implementations. Our results identify phase-space curvature as a resource for optimizing the speed and performance of quantum sensors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_05047 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Instability-Enhanced Quantum Sensing with Tunable Multibody Interactions Vijaywargia, Bidhi Chávez-Carlos, Jorge Pérez-Bernal, Francisco Santos, Lea F. Quantum Physics Dynamical instabilities can amplify small perturbations into measurable signals, offering a route to quantum-enhanced sensing. This mechanism was experimentally demonstrated in a collective-spin system with quadratic interactions, described by a twisting-and-turning Hamiltonian, where quantum evolution near an unstable point leads to exponential growth of spin fluctuations, enabling metrological gain beyond the standard quantum limit. Here, we show that a quartic extension of this Hamiltonian substantially increases the amplification. The additional nonlinear term reshapes the phase-space structure, generating new unstable points and accelerating signal amplification. As a result, enhanced sensitivity is achieved within experimentally accessible coherence times. Remarkably, even at fixed instability rate (equal Lyapunov exponent), multibody interactions outperform the quadratic case due to enhanced short-time dynamics. We analyze the classical and quantum behavior of the multibody model and discuss its experimental implementations. Our results identify phase-space curvature as a resource for optimizing the speed and performance of quantum sensors. |
| title | Instability-Enhanced Quantum Sensing with Tunable Multibody Interactions |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2604.05047 |