  In the burgeoning domain of distributed quantum computing, achieving
consensus amidst adversarial settings remains a pivotal challenge. We introduce
an enhancement to the Quantum Byzantine Agreement (QBA) protocol, uniquely
incorporating advanced error mitigation techniques: Twirled Readout Error
Extinction (T-REx) and dynamical decoupling (DD). Central to this refined
approach is the utilization of a Noisy Intermediate Scale Quantum (NISQ) source
device for heightened performance. Extensive tests on both simulated and
real-world quantum devices, notably IBM's quantum computer, provide compelling
evidence of the effectiveness of our T-REx and DD adaptations in mitigating
prevalent quantum channel errors.
  Subsequent to the entanglement distribution, our protocol adopts a
verification method reminiscent of Quantum Key Distribution (QKD) schemes. The
Commander then issues orders encoded in specific quantum states, like Retreat
or Attack. In situations where received orders diverge, lieutenants engage in
structured games to reconcile discrepancies. Notably, the frequency of these
games is contingent upon the Commander's strategies and the overall network
size. Our empirical findings underscore the enhanced resilience and
effectiveness of the protocol in diverse scenarios. Nonetheless, scalability
emerges as a concern with the growth of the network size. To sum up, our
research illuminates the considerable potential of fortified quantum consensus
systems in the NISQ era, highlighting the imperative for sustained research in
bolstering quantum ecosystems.
