Quantum Software Companies
How middleware, error correction and application platforms compete to become the infrastructure above the QPU
Quantum computing is still often assessed through hardware metrics: qubit counts, fidelity, coherence and the race toward fault-tolerant machines. This perspective remains necessary, but it does not fully capture where industrial value may form. Between unstable quantum processors and real users sits a growing software layer that determines how quantum programs are written, compiled, executed, error-suppressed, error-corrected, simulated and integrated into classical workflows. The central issue is whether companies that do not build QPUs can nevertheless become infrastructural actors by controlling the software layers that make quantum hardware usable.