Universal Limits on Quantum Correlations

• URL: http://arxiv.org/abs/2510.24950v1
• Date: Tue, 28 Oct 2025 20:33:38 GMT
• Title: Universal Limits on Quantum Correlations
• Authors: Samuel Alperin,
• Abstract summary: The limits of quantum correlations set the foundation of quantum mechanics and quantum information science.<n>Here we introduce a general framework from which all known correlation limits, as well as new ones, can be derived.<n>We show that every correlation bound, old or new, exhibits local catastrophe-theoretic structure.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The fundamental limits of quantum correlations set the foundation of quantum mechanics and quantum information science. Exact bounds-the Cramer-Rao inequality, the Heisenberg limit, and the Lieb-Robinson bound-have anchored entire fields, yet each applies only to a narrow class of systems or observables. Here we introduce a general framework from which all known correlation limits, as well as new ones, can be derived from a single geometric principle: the positivity of quantum state space. This intrinsic positive geometry defines a unique determinant-ratio invariant, denoted chi, which quantifies the combinatorial structure of correlations in any quantum system. Every measure of nonclassical correlation is bounded by a simple function of chi, yielding universal, model-independent floors and ceilings valid for arbitrary architectures. For systems with Lie-group symmetries, the bounds acquire compact closed forms. We recover the Heisenberg and Cramer-Rao limits and uncover previously unknown constraints, including an exact entanglement floor in multimode squeezing networks and a universal Fisher-information ceiling in fully connected spin ensembles-demonstrating that even all-to-all connectivity cannot exceed the positivity-imposed light cone in state space. Finally, we show that every correlation bound, old or new, exhibits local catastrophe-theoretic structure, with universal critical exponents classifying its approach to saturation. Positivity geometry thus provides a unified, first-principles theory of quantum limits.

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