A 3D re-entrant cavity filter enables frequency-multiplexed readout of four superconducting qubits with 98.6% average fidelity in 1 microsecond and low crosstalk, with simulated intrinsic Purcell filtering.
Acharya et al., Suppressing quantum errors by scaling a surface code logical qubit, Nature 614, 676 (2022)
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Multiplexed Readout of Superconducting Qubits Using a 3D Re-entrant Cavity Filter
A 3D re-entrant cavity filter enables frequency-multiplexed readout of four superconducting qubits with 98.6% average fidelity in 1 microsecond and low crosstalk, with simulated intrinsic Purcell filtering.