Mid-circuit Measurements for Superconducting Qubits

There is a growing need for mid-circuit measurements (MCMs) in quantum computing. MCMs are crucial for performing syndrome extraction in quantum error correction, and --- along with feed-forward operations conditioned on the result of the measurement --- can be used to efficiently prepare entangled states in adaptive circuits. However, performing MCMs and feed-forward operations are difficult for superconducting systems due to the classical hardware requirements imposed by the fast gate times of superconducting qubits. In this talk, we will outline the state of MCMs for superconducting processors, discuss the difficulties in implementing feed-forward operations, and demonstrate ways in which MCMs can be improved. We will also provide examples of the various quantum applications that can benefit from MCMs and feed-forward operations.