Techniques regarding routing qubit data are provided. For example, one or more embodiments described herein can comprise a computer-implemented method for training a quantum controller fast path interface that can control the qubit data routing. The computer-implemented method can comprise training, by a system operatively coupled to a processor, the quantum controller fast path interface for routing qubit data bits between a quantum controller and conditional engine by adjusting a delay value such that a mesochronous clock domain is characterized by a direct register-to-register transfer pattern.