Indigenous Quantum Computing Simulation Platform (QSim)

India's National Quantum Mission (Rs 6,003 crore / $730 million over 8 years) has established dedicated research hubs across India's top institutions, but a pragmatic near-term output is QSim — a quantum computer simulator toolkit developed collaboratively by C-DAC (Centre for Development of Advanced Computing) and DIAT (Defence Institute of Advanced Technology). QSim allows researchers, students, and industry professionals to develop, test, and optimize quantum algorithms on classical computers, without requiring access to scarce physical quantum hardware. The platform supports simulation of various quantum gate operations, error models, and hybrid quantum-classical algorithms.

The Quantum Computing Hub at IIT Guwahati, with Rs 653 crore in sanctioned funding, is leading development of physical quantum computing systems targeting 50-1000 qubits by 2031. Quantum communication research targets satellite-based quantum key distribution over 2,000 km — critical for securing India's digital infrastructure against future quantum attacks. The Quantum Sensing hub focuses on applications in navigation (quantum inertial sensors for submarines and aircraft) and medical imaging (quantum-enhanced MRI and magnetoencephalography).

India's quantum strategy is pragmatic: rather than competing head-to-head with Google, IBM, or China on qubit counts, it's building a broad-based quantum research ecosystem and focusing on applications where quantum advantages are clearest. The post-quantum cryptography angle is particularly urgent — India's entire digital public infrastructure (Aadhaar, UPI, India Stack) relies on encryption that quantum computers could eventually break. Developing indigenous quantum computing capability and quantum-resistant cryptography is therefore a national security imperative, not just a research exercise.