Explicit C*-algebraic Protocol for Exact Universal Embezzlement of Entanglement

• URL: http://arxiv.org/abs/2506.10736v1
• Date: Thu, 12 Jun 2025 14:26:11 GMT
• Title: Explicit C*-algebraic Protocol for Exact Universal Embezzlement of Entanglement
• Authors: Li Liu,
• Abstract summary: We present an explicit construction of a universal embezzlement protocol in the C*-algebraic model of quantum information.<n>Our approach is both exact and state-independent.<n>This offers a conceptually intuitive model for universal entanglement embezzlement in infinite-dimensional settings.
• Score: 6.478015108834015
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present an explicit construction of a universal embezzlement protocol in the C*-algebraic model of quantum information, that is equivalent to the commuting operator model. Our protocol enables exact embezzlement of arbitrary bipartite pure states using a single, fixed catalyst state. Unlike prior constructions that achieve only approximate embezzlement or require state-dependent catalysts, our approach is both exact and state-independent. The construction is explicit, based on simple *-automorphisms acting locally on infinite tensor products of CAR algebras with the underlying idea of the Hilbert hotel. In the dense-state case, the protocol naturally recovers the Type III_1 factor via the GNS construction, consistent with recent classification results. We further extend the construction to allow exact embezzlement of all states, at the cost of working with a non-separable C*-algebra. Despite the increase in algebraic size, the operational structure remains simple and localized. This offers a conceptually intuitive model for universal entanglement embezzlement in infinite-dimensional settings.

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