Optimal four-copy detector boosts three-tangle detection probability over 5x
MvsCerezo · x · 2026-10-25
The author presents an optimal four-copy detector for genuine tripartite entanglement (three-tangle) in pure three-qubit states, with over 5x higher detection probability than prior constructions, meaning far fewer measurements. The trade-off: the optimal circuit uses 15 CNOTs vs 5 previously, and can require hundreds of T gates under fault tolerance, while a less efficient detector is fully Clifford.
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