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Entanglement concentration protocols now function reliably even with sublinear deviations from ideal quantum states, removing a major barrier to practical implementation. This advancement allows near-perfect manipulation rates using "almost i.i.d." sources, significantly improving the robustness of real-world quantum communication networks against inherent source imperfections. The findings provide universal tools for information-theoretic applications without requiring previously unrealistic perfect state conditions.

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Entanglement Survives Data Imperfections, Boosting Quantum Communication Reliability

Quantum ZeitgeistJune 9, 20265 min read

Entanglement concentration now functions at rates below the entropy of entanglement $S(φA)$, mirroring ideal quantum sources despite imperfections. Previously, maintaining these rates required perfect source conditions, an unrealistic demand for practical quantum technologies. This work demonstrates that near-ideal, almost i.

Nilanjana Datta from the University of Cambridge and colleagues have demonstrated that entanglement concentration and dilution are achievable even with a sublinear number of deviations from a standard tensor-power structure, utilizing Mazzola, Sutter, Renner almost i.i.d. sources. These perturbed sources exhibit the same asymptotic behavior as perfectly i.i.d. states, and a universal protocol for entanglement concentration dependent only on the reference state, rather than the specific source sequence, is now available. These findings advance understanding of key entanglement protocols and have potential implications for various information-theoretic applications. Entanglement measures now achieve rates within 1%…

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