Analytical multi-level LZSM optimization plus Floquet-Born-Markov open-system fidelity shows fluxonium Y(π/2) gates under 1.3 ns with error below 10^{-5} at privileged drive frequencies.
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A staged transmon pulse (PESP) treats transient leakage exposure and endpoint leakage as separate targets, cutting dephasing-induced leakage by ~20% in four-level simulations.
Leakage hopping persists at 0.8-10 MHz even when couplers cancel single-excitation exchange or ZZ interaction due to transmon nonlinearity; frequency detuning localizes it, with 1-4 MHz next-nearest-neighbor spread needed to suppress longer hops, and two passive removal units are proposed.
citing papers explorer
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Optimizing LZSM protocol for high-fidelity gates in open-system fluxonium
Analytical multi-level LZSM optimization plus Floquet-Born-Markov open-system fidelity shows fluxonium Y(π/2) gates under 1.3 ns with error below 10^{-5} at privileged drive frequencies.
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Separate Control of Transient Leakage Exposure and Endpoint Leakage in Fast Transmon Gates
A staged transmon pulse (PESP) treats transient leakage exposure and endpoint leakage as separate targets, cutting dephasing-induced leakage by ~20% in four-level simulations.
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Leakage Mobility and Passive Leakage Removal in Transmons with Tunable Couplers
Leakage hopping persists at 0.8-10 MHz even when couplers cancel single-excitation exchange or ZZ interaction due to transmon nonlinearity; frequency detuning localizes it, with 1-4 MHz next-nearest-neighbor spread needed to suppress longer hops, and two passive removal units are proposed.