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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Dual-rail CTQW on transmon arrays enables photon-number conserving single-, two-, and three-qubit gates with built-in erasure conversion for superconducting quantum logic.
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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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Photon-Number Conserved Universal Quantum Logic Employing Continuous-Time Quantum Walk on Dual-Rail Qubit Arrays
Dual-rail CTQW on transmon arrays enables photon-number conserving single-, two-, and three-qubit gates with built-in erasure conversion for superconducting quantum logic.