A determinantal geometry framework for two-qubit gates quantifies nonlocal complexity via distances to local-operation varieties, showing the square root iSWAP is closest to local gates and no perfect entangler exceeds 79.8% average fidelity under local approximation.
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Generalization of the one-tangle metric to higher-spin nuclei enables quantification of maximal electron-nuclear entanglement and direct computation of dephasing times in central-spin systems such as (In)GaAs quantum dots.
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Low-rank geometry of two-qubit gates
A determinantal geometry framework for two-qubit gates quantifies nonlocal complexity via distances to local-operation varieties, showing the square root iSWAP is closest to local gates and no perfect entangler exceeds 79.8% average fidelity under local approximation.
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Quantifying electron-nuclear spin entanglement dynamics in central-spin systems using one-tangles
Generalization of the one-tangle metric to higher-spin nuclei enables quantification of maximal electron-nuclear entanglement and direct computation of dephasing times in central-spin systems such as (In)GaAs quantum dots.