Bias-preserving cat-cat CNOT gate via vacuum-conditional beam-splitter
A paper on arXiv proposes a bias-preserving CNOT gate for cat qubits realized via a vacuum-conditional beam-splitter. The gate is designed to preserve the dominant error bias of cat qubits, preventing conversion of bit-flip to phase-flip errors during two-qubit operations. This addresses a key challenge in fault-tolerant quantum computing with biased-noise bosonic codes.
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What this could mean
- 0–2 yearsPlausible
Experimental demonstration of this gate could enable low-overhead fault-tolerant operations in cat-qubit processors, bringing such architectures closer to error-corrected operation within two years.
Bias-preserving single-qubit gates for cat qubits have been shown, and vacuum-conditional operations exist in circuit QED. Integrating this CNOT into existing cat-qubit systems is plausible with current fabrication and control capabilities.
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