A single multimode resonator enables unconditional qubit reset below 1% residual excitation in 220 ns and selective leakage reduction to 6.1% |f> population in 62 ns, with intrinsic Purcell protection preserving relaxation times despite direct coupling.
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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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Multimode Purcell Filter for Superconducting-Qubit Reset and Readout with Intrinsic Purcell Protection
A single multimode resonator enables unconditional qubit reset below 1% residual excitation in 220 ns and selective leakage reduction to 6.1% |f> population in 62 ns, with intrinsic Purcell protection preserving relaxation times despite direct coupling.
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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.