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Kyung Hee University researchers have established a fundamental mathematical boundary showing that specific compositions of qutrit quantum maps inevitably destroy entanglement. This finding clarifies the operational limits for entanglement swapping, a critical mechanism required for building scalable quantum repeater networks. By defining these constraints beyond previous conjectures, the study provides essential theoretical guidance for advancing long-distance quantum communication protocols.

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Kyung Hee Researchers Prove Qutrit Link Composition Limits Entanglement

Quantum ZeitgeistAugust 20, 20264 min read

Kyung Hee University researchers prove that Qutrit Link Composition limits entanglement swapping, a key process for quantum repeaters.

Researchers at Kyung Hee University have proven that certain compositions of qutrit completely positive (CP) maps are entanglement breaking, revealing a precise relationship governing how these systems behave. The study demonstrates that composing any CP map with another CP map whose Choi matrix has Schmidt number at most two destroys entanglement, in either order. This finding establishes a clear boundary for the specific maps investigated. the research shows that any -undistillable two-qutrit…

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