Entanglement Requirements for Coherent Enhancement in Detectors

• URL: http://arxiv.org/abs/2605.08337v1
• Date: Fri, 08 May 2026 18:00:00 GMT
• Title: Entanglement Requirements for Coherent Enhancement in Detectors
• Abstract summary: We show that coherent enhancement of a signal interacting with a detector is quantitatively constrained by entanglement.<n>We prove general bounds on how the strength of coherent effects can scale with system size.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Coherent enhancement is a powerful mechanism for improving the sensitivity of a wide range of detectors, but its practical use is often limited by the difficulty of preparing the required quantum states. We show that this difficulty has a fundamental origin: coherent enhancement of a signal interacting with a detector is quantitatively constrained by entanglement. We prove general bounds on how the strength of coherent effects can scale with system size, as a function of the single-mode entanglement entropy of the detector. These bounds smoothly interpolate between the incoherent and fully coherent regimes, and apply both to parameter-estimation problems and to scattering processes. We discuss these results from two complementary perspectives: First, they appear as bounds on the quantum Fisher information of many-body states, which translate directly into limits on parameter sensitivity via the quantum Cramér-Rao bound. Second, they can be interpreted as limits on a class of scattering cross sections, leading to predictions for how minimum detectable interaction strengths scale with target size. Together, these results provide a unified view of coherent enhancement in metrology and scattering experiments, and motivate the development of new techniques for generating entangled detector states.

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