The Arms Dealers of Quantum
Control systems and cryogenic infrastructure behind the QPU
Quantum computing is usually discussed through qubit counts, processor roadmaps, modality competition and cloud access, but every QPU depends on a less visible industrial layer before it can become an operable machine. Control electronics, readout systems, calibration software, dilution refrigerators, cryogenic wiring, filtering, amplification and serviceable low-temperature infrastructure determine whether a quantum processor can be driven, measured, maintained and scaled. The strategic question is whether suppliers such as Quantum Machines, Qblox, Zurich Instruments, Bluefors and the former Oxford Instruments NanoScience business represent the real upstream bottleneck of quantum industrialisation: technically indispensable, commercially defensible, but not always directly investable.