The Hidden Supply Chain of Quantum Computing

The world watches the qubit; the value, the margin and the dependency sit everywhere else. This report maps the hidden supply chain beneath quantum computing — cryogenics, control electronics, photonics, packaging and high-purity materials — where a 100-qubit machine's cost actually accrues (the qubit chip is under 8%; the hidden stack is about 63% of a ~$5.15M system). It scores India's capability layer by layer against the global frontier, finds near-total import dependency and single-source chokepoints across every critical component, sizes the patent, funding and talent gaps, and sets out a ten-year, ~$5.25 billion industrial roadmap to build a defensible position. 150+ pages, 69 figures, 20 tables, five appendices with company, startup, policy and funding databases, and a 17-sheet data workbook.