Lighter fluxonium qubits show lower susceptibility to measurement-induced state transitions than heavier counterparts due to reduced multi-photon resonance density, smaller required coupling, and more harmonic charge operator structure.
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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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Measurement-induced state transitions across the fluxonium qubit landscape
Lighter fluxonium qubits show lower susceptibility to measurement-induced state transitions than heavier counterparts due to reduced multi-photon resonance density, smaller required coupling, and more harmonic charge operator structure.
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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.