Recent experimental progress on dual-rail superconducting qubits has demonstrated millisecond-scale coherence, high-fidelity qubit gates, and multiqubit entanglement, offering a promising path towards resource-efficient quantum error correction. Fast reset and rapid state preparation are becoming critical requirements as dual-rail quantum processors scale up. In this work, we introduce the technique of applying dual driving fields with in-phase and out-of-phase configurations to both physical qubits of the dressed two-qubit system, which aligns with the dual-rail logical subspace structure defined as the symmetric and antisymmetric combinations of $|10\rangle$ and $|01\rangle$. We show that the desired (unwanted) transitions of the dressed two-qubit system can be selectively opened (suppressed) by dual external fields and used to synthesize a three-level system with all transitions controllable by qubit frequency modulation. Our work bridges fundamental quantum control theory with immediate experimental relevance to dual-rail encoding for a general physical system.

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• Quantum control
• Qubits
• Two-level systems