Implementation of logical entangling gates is an important step towards realizing a quantum computer. We use a gradient-based optimization approach to find single-qubit rotations which can be interleaved between applications of a noisy nonlocal gate to dramatically suppress arbitrary logical errors, while steering the evolution operator towards the perfectly entangling subset of $\text{SU}\left(4\right)$ gates. The modularity of the approach allows for application to any two-qubit system, regardless of the Hamiltonian or details of the experimental implementation. This approach is effective for both quasistatic and time-dependent $1/f^{\alpha }$ noise. We also show how the fidelity of the final operation depends on both the fidelity of the local rotations and the noise strength.

• Received 1 May 2018

DOI:https://doi.org/10.1103/PhysRevA.97.062339