A globally controlled qubit ring with no transport auxiliary qubits can run a cyclic stabilizer code, with simulated QEC thresholds around 0.1-0.5%.
Quantum control for high-fidelity multi-qubit gates
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abstract
Quantum control for error correction is critical for the practical use of quantum computers. We address quantum optimal control for single-shot multi-qubit gates by framing as a feasibility problem for the Hamiltonian model and then solving with standard global-optimization software. Our approach yields faster high-fidelity ($>$99.99\%) single-shot three-qubit-gate control than obtained previously, and our method has enabled us to solve the quantum-control problem for a fast high-fidelity four-qubit gate.
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quant-ph 1years
2026 1verdicts
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Quantum error correction with global control
A globally controlled qubit ring with no transport auxiliary qubits can run a cyclic stabilizer code, with simulated QEC thresholds around 0.1-0.5%.