Real-Time Adaptive Filtering and the Boxcar Limit in Superconducting Qubit Readout
The work uses a boxcar averager—uniform weighted averaging over a fixed window—as the baseline for superconducting qubit dispersive readout. It then examines when additional real-time digital filtering could improve qubit-state discrimination fidelity.
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What this could mean
- 0–2 yearsPlausible
If the paper identifies regimes where adaptive filters beat boxcar averaging, existing superconducting control stacks could add firmware-level filtering to gain readout fidelity without replacing analog or cryogenic hardware.
Modern control systems already implement real-time digital signal processing; swapping a fixed boxcar for an adaptive filter is a software/firmware change, so deployment could happen quickly. The open question is whether the paper finds sufficient fidelity improvement to justify it.
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