Phase-Modulated Entangling Gates Robust to Static and Time-Varying Errors

In quantum computing systems where entangling logic gates are mediated via bosonic oscillator modes ($e.g.$ trapped ions), residual coupling between qubits and oscillator is a dominant source of gate infidelity. This work shows how discrete phase modulation of the field mediating the entangling operation ensures that the system of qubits is decoupled from multiple oscillator modes, even in the presence of common time-varying sources of noise and hardware instability. The results demonstrate the capabilities of quantum control to drive major performance advances in quantum computing.