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Bulletin of the American Physical Society

Systematic and Deterministic Graph-Minor Embedding of Cartesian Products of Complete Graphs

Arman Zaribafiyan, D. J. J. Marchand, Seyed Saeed Changiz Rezaei

Published Mar 15, 2016• 1 citation
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Entanglement in quantum graph states is intrinsically linked to rank-width, a graph complexity measure introduced by Oum and Seymour. In this work, we enable the preparation of maximally entangled deterministic graph states in constant depth by developing a general method to derive lower bounds on the rank-width of regular graphs from their edge expansion. By bridging edge-isoperimetric inequalities with the strong chromatic index and Jelínek's approach for lower bounding cut-rank, we systematically establish lower bounds for the rank-width of Cartesian products, including hypercubes, Hamming graphs, and grids. Extending this framework via Boolean function analysis, using a generalization of the Kahn-Kalai-Linial's Theorem, we strengthen the bounds for all Cartesian products by a non-trivial logarithmic factor. These methods result in the discovery of deterministic families of graphs on nnn vertices with a provably maximum rank-width Θ(n)Θ(n)Θ(n). Our results fill the previous gap in the literature for deterministic graph families of rank-width greater than Θ(n)Θ(\sqrt{n})Θ(n​).