Quantum error correction is being reexamined in light of heterogeneous quantum systems, which combine qubits and higher-dimensional qudits. Traditional metrics for quantum error correction are no longer sufficient for these complex systems. Researchers have introduced a new mathematical framework based on dimension multisets to characterize quantum error-correcting codes in these mixed-dimensional systems1. This framework provides a way to analyze and optimize quantum error correction in heterogeneous architectures, which is crucial for the development of robust and reliable quantum computing. The mixed-dimensional quantum MacWilliams identity is a key component of this framework, providing bounds for codes and absolutely maximally entangled states. This development has significant implications for the field of quantum computing, as it enables the creation of more efficient and resilient quantum error-correcting codes. So what matters to practitioners is that this new framework can help overcome the limitations of traditional quantum error correction methods, paving the way for more advanced quantum computing applications.