  Qutrit state readout is an important technology not only for execution of
qutrit algorithms but also for erasure detection in error correction circuits
and leakage error characterization of the gate set. Conventional technique
using a specialized IQ discriminator requires memory intensive IQ data for
input, and has difficulty in scaling up the system size. In this study, we
propose the mid-circuit measurement based discrimination technique which
exploits a binary discriminator for qubit readout. Our discriminator shows
comparable performance with the IQ discriminator, and readily available for
standard quantum processors calibrated for qubit control. We also demonstrate
our technique can reimplement typical benchmarking and characterization
experiments such as leakage randomized benchmarking and state population decay
measurement.
