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arXiv:quant-ph/0406203

Fisher, Kaehler, Weyl and the quantum potential

Robert Carroll

Published Jun 28, 2004• 0 citations
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Abstract

Connections between Fisher information, Kaehler geometry of a quantum projective Hilbert space, and the Weyl-Ricci scalar curvature of a Riemannian flat spacetime with quantum matter are sketched.
DOI
10.48550/arxiv.quant-ph/0406203

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Quantum information theory is traditionally formulated on projective state spaces, where the qubit is a point in ℂP¹. We introduce a new computational primitive—"the flubit"—defined as a point in the flag manifold Fl₁,₂(ℂ³), representing a line ℓ inside a plane P in ℂ³. This extends the hierarchy: bit → qubit → qutrit → flubit{0,1} → ℂP¹ → ℂP² → Fl₁,₂(ℂ³) Unlike projective spaces, the flag manifold carries intrinsic hierarchy: coarse (plane), fine (line), and their coupling via connection curvature Ω. We construct the Fisher information geometry of Fl₁,₂(ℂ³) and show it decomposes into base, fiber, and cross-term contributions. The cross-term vanishes for separable states and is nonzero precisely when the Weyl relation x² + xy + y² = 0 is activated. This yields a reinterpretation: entanglement is not a relation between subsystems, but the internal coherence of a single flubit. Standard two-qubit entanglement arises as the residual correlation left after projecting away the flag structure. We define the flubit–projective gap Δ(ψ), the excess Fisher information accessible through hierarchical measurements beyond independent projective ones. Δ(ψ) quantifies entanglement and provides a candidate measure of quantum computational advantage. On the product manifold M = Fl₁,₂(ℂ³) × ℂP¹, three structures coincide: Kähler geometry = quantized phase space (Kay) = information geometry (Fisher/Braunstein–Caves) Finally, we compute the Ricci curvature of the flag Fisher metric and show its eigenvalue structure constrains the gauge coupling hierarchy, with the Einstein constant λ = 2 emerging as the Ricci normalization. The flubit is the first non-projective computational primitive, and the flag manifold provides the minimal geometry where hierarchy, entanglement, and information are unified.
Abstract We present a covariant generalization of the Phase–Cone Inequality to curved geometries, formulating it within both Riemannian and Finsler frameworks. In the flat limit, the inequality reduces to vϕ2≤κn(ΔΦ)2,v_{\phi}^{2} \leq \kappa_{n} (\Delta \Phi)^{2},vϕ2≤κn(ΔΦ)2, where κn\kappa_{n}κn is the multicarrier curvature coefficient characterizing interference order. Here, curvature and analytic continuation introduce two new covariant terms: the geometric curvature penalty K[u,ω]K[u,\omega]K[u,ω], governed by the Ricci or Finsler–Ricci tensor, and the analytic continuation term An[g;Φ]A_{n}[g;\Phi]An[g;Φ], carrying the transcendental constants (π,ζ(3),ζ(5),…)(\pi, \zeta(3), \zeta(5), \ldots)(π,ζ(3),ζ(5),…) that encode the parity–driven analytic hierarchy previously identified in flat CnC_{n}Cn manifolds. The resulting covariant form, vϕ2≤κn(ΔΦ)2−K[u,ω]+An[g;Φ],v_{\phi}^{2} \leq \kappa_{n} (\Delta \Phi)^{2} - K[u,\omega] + A_{n}[g;\Phi],vϕ2≤κn(ΔΦ)2−K[u,ω]+An[g;Φ], links quantum phase transport to local spacetime curvature and analytic number–theoretic structure. In the Finsler extension, anisotropic phase propagation introduces direction–dependent curvature coupling through the Finsler–Ricci scalar. These results imply that phase dynamics in curved or anisotropic backgrounds are constrained by both geometric focusing (Ricci contraction) and analytic opening (zeta hierarchy), offering a unified geometric–analytic limit for the speed of quantum evolution.