Error semitransparent universal control of a bosonic logical qubit

Abstract Bosonic codes offer hardware-efficient quantum error correction, recently achieving beyond-breakeven quantum memory. However, fault-tolerant logical operations remain a critical bottleneck. While error transparent (ET) gates offer a pathway to resolve this, experimental demonstrations remain limited to phase gates. Here, we introduce a dynamic encoding subspaces framework that enables simple linear drives to accomplish universal logical gates that are error semi-transparent (EsT) to oscillator photon loss. Our EsT logical gate set of { X , H , T } exhibited a five-fold reduction in infidelity conditioned on photon loss, extended active-manipulation lifetimes with quantum error correction, and enabled a composite EsT non-Clifford operation using an eight-gate sequence. Our approach is compatible with methods for detectable ancilla errors and is readily extensible to other rotation-symmetric codes, offering an approach to error-mitigated universal control of bosonic logical qubits with the standard quantum control toolkit and a coherent framework for incorporating more sophisticated quantum control methods.