Absorption capacity of separable noise: Bell-mixing thresholds on separability and teleportation

• URL: http://arxiv.org/abs/2606.31243v2
• Date: Sat, 04 Jul 2026 10:32:32 GMT
• Title: Absorption capacity of separable noise: Bell-mixing thresholds on separability and teleportation
• Abstract summary: We study Bell-mixing lines $_=+ + (1-)$, where $+$ is a fixed Bell reference and $$ is a separable two-qubit noise state.<n>Along this line there are two operational crossings: the state becomes entangled, and it reaches quantum teleportation advantage over classical strategies.<n>We derive closed-form capacities and thresholds for product noise states and separable complex $X$ noise states.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study Bell-mixing lines $ρ_λ=λΦ^+ +(1-λ)σ$, where $Φ^+$ is a fixed Bell reference and $σ$ is a separable two-qubit noise state. Along this line there are two operational crossings: the state becomes entangled, and it reaches quantum teleportation advantage over classical strategies. We package these crossings as capacities of the noise state. The entanglement absorption capacity $C_{\rm abs}(σ)$ is the largest amount of Bell reference that $σ$ can absorb while the partial transpose remains positive. The fidelity absorption capacity $C_F(σ)$ is the largest amount of Bell reference that $σ$ can absorb while keeping the maximal teleportation fidelity at or below the classical bound $2/3$. The thresholds corresponding to the two crossing points are obtained from the same Möbius map, $λ_* = C_{\rm abs}/(1+C_{\rm abs})$ and $λ_F = C_F/(1+C_F)$. We derive closed-form capacities and thresholds for product noise states and separable complex $X$ noise states. For product noise, $C_{\rm abs}$ depends only on local marginal purities, while $C_F$ also depends on orientation relative to the maximally entangled reference. For $X$ noise states, both capacities are explicit in all four Bell frames. We also study three extensions: arbitrary pure-state references, the evolution of $X$ noise states and their capacities under local amplitude-damping and dephasing channels, and decomposition certificates that give lower bounds on the capacities, hence on the thresholds, for general separable noise.

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