entanglement-manipulation-robustness

# Robustness of Entanglement Manipulation for almost i.i.d. sources **arXiv**: 2606.06392 **Authors**: Nilanjana Datta **Category**: quant-ph **Published**: 2026-06-04 ## Abstract We study the robustness of asymptotic entanglement manipulation beyond the exact i.i.d. regime, focusing on Mazzola--Sutter--Renner (MSR) almost i.i.d. sources, which allow a sublinear number of deviations from a tensor-power structure. For pure MSR sources along a bipartite reference state, we prove that the entanglement concentration rate is robust: every rate below the entropy of entanglement remains achievable. Moreover, this can be done by a single Schur--Weyl concentration protocol that is universal within the MSR class, depending only on the reference state and not on the particular source sequence. For mixed MSR sources along a reference state, we prove a source-dependent entanglement-distillation achievability result: every rate below the coherent information of the reference state is achievable, although the entanglement distillation protocol may depend on the particular MSR source sequence. For the reverse task of entanglement dilution, we prove a rate-robustness theorem: the asymptotic entanglement cost of any MSR target sequence along the reference state is at most the regularized entanglement of formation of the reference state. To establish these results, we prove structural and entropic properties of MSR almost i.i.d. sequences which may be useful in other information-theoretic settings. ## Core Methodology ### Key Results - Paper presents novel methodology for quant-ph - Mathematical framework with rigorous proofs - Applications to related computational problems ### Implementation Steps 1. Study the theoretical framework presented in the paper 2. Implement the core algorithm/methodology 3. Validate against benchmark datasets 4. Apply to real-world use cases ## Pitfalls - Ensure proper handling of edge cases in mathematical formulations - Verify numerical stability for large-scale implementations - Check boundary conditions in theoretical proofs ## Verification - Run unit tests on core methodology - Compare results with paper's reported values - Validate on independent datasets ## Activation **Keywords**: robustness of entanglement manipulation for