Bunny Codes: Broadening Superconducting Quantum Error Correction Capability through Advanced Control Engineering
A preprint studies superconducting quantum error correction for qLDPC codes with nonlocal stabilizers. It examines how an enriched native two-qubit gate set — CNOT plus CXSWAP — can simplify syndrome extraction circuits. The work, titled 'Bunny Codes,' presents an exhaustive analysis of these gate-set advantages.
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What this could mean
- 0–2 yearsPlausible
Superconducting hardware teams could adopt CXSWAP as a native gate within two years, enabling small qLDPC codes with nonlocal stabilizers to be tested on existing fixed-connectivity processors without costly SWAP decompositions.
Tunable couplers already give processors like IBM's and Google's the physical interaction needed; adding CXSWAP is primarily a control-level change rather than a fabrication one. If the circuit-depth reductions hold, the remaining bottleneck is limited qubit connectivity, which native CXSWAP directly mitigates.
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