From Digital India to Quantum India: A Policy Roadmap for Quantum-Ready Governance

India's digital public infrastructure — identity, payments, data exchange and online services — was built over a decade under the Digital India programme. A second technology transition is now under way. Quantum computing, quantum communication and quantum sensing are moving from laboratories into early applications, and the National Quantum Mission (2023) commits public funds to building national capability. For governments, the question is no longer whether quantum technologies matter but how to prepare public institutions for them in an orderly way. This policy paper argues that states and central ministries should treat "quantum readiness" as a governance agenda rather than a purely scientific one. It reviews the lessons of Digital India that carry over, identifies four areas in which quantum technologies will affect government (security of digital public infrastructure, decision support, sensing for public services, and the skills base), and proposes a phased roadmap with ten actions across three horizons: protect (2026–2028), pilot (2027–2030) and scale (2030 onwards). The most urgent action is cryptographic: government systems that hold long-lived citizen data should begin inventorying and planning migration to post-quantum cryptography now. The paper is a perspective drawn from the author's experience in state e-governance programmes and in quantum-enabled health technology; it does not report empirical results.