Breaking the symmetry of a transmon capacitor activates multi-mode interference that can suppress Purcell decay, shown analytically, in simulation, and in one four-qubit device.
Suppressing quan- tumerrorsbyscalingasurfacecodelogicalqubit,
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Intrinsic Multi-Mode Interference for Passive Suppression of Purcell Decay in Superconducting Circuits
Breaking the symmetry of a transmon capacitor activates multi-mode interference that can suppress Purcell decay, shown analytically, in simulation, and in one four-qubit device.