Quantum technologies represent a paradigm shift in computational, sensing, and communication capabilities with profound implications for national security. Unlike most defence technologies that offer incremental improvements, quantum systems promise step-changes in capability: computing power that can break current encryption standards, sensors that can detect submarines through ocean turbulence, and communications channels that are physically impossible to intercept. The Bharat Defence Tech Show has dedicated significant attention to this emerging domain, positioning India's defence establishment to capitalise on the quantum revolution.
India's National Mission on Quantum Technologies and Applications (NM-QTA) has established a framework for government investment in quantum research, with defence applications explicitly identified as a priority. BDTS discussions have examined how DRDO's quantum research programmes — including work on quantum key distribution for secure military communications and quantum radar concepts — align with the broader national mission and where private sector collaboration can accelerate progress.
Quantum sensing represents perhaps the nearest-term defence application of quantum technologies. Quantum gravimeters can detect underground tunnel complexes that defeat conventional detection methods. Quantum magnetometers can track submarine movements with unprecedented sensitivity. Quantum accelerometers can provide navigation capability independent of GPS — critical for operations in contested environments where satellite signals may be jammed or spoofed. BDTS has hosted India's leading quantum sensing researchers alongside defence procurement officials, generating productive dialogues about development timelines and procurement strategies.
Post-quantum cryptography — the development of classical encryption algorithms that remain secure even against quantum computer attacks — is an urgent priority for India's defence establishment. BDTS has raised awareness of the need to audit military communication systems and begin the transition to quantum-resistant protocols before adversaries achieve cryptographically relevant quantum computers.
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