The Defence Research and Development Organisation (DRDO) has successfully tested a Quantum Key Distribution (QKD) platform on the live network of dynamic test ranges at the Proof and Experimental Establishment (PXE) in Chandipur, Odisha. The trial marks a significant step in India's efforts to strengthen quantum-secured communications.

The test demonstrates the practical use of quantum cryptography in defence environments. The technology can protect real-time observations and telemetry generated during artillery and armoured weapon trials, where securing sensitive data is essential.

QKD uses the principles of quantum mechanics to help two parties generate a shared secret key. The key encrypts and decrypts information, protecting communications from unauthorised access. Unlike conventional cryptography, which relies on mathematical complexity, QKD can detect eavesdropping attempts. Any interception disturbs the quantum state used during transmission, alerting users to a potential intrusion.

DRDO's Microelectronic Devices, Computational Systems and Cyber Security (MCC) cluster developed the platform in partnership with Taqbit Labs. The system aims to provide unconditional security while detecting attempts to intercept the key exchange process.

Quantum-secured communications are gaining importance as defence systems increasingly depend on connected networks and real-time data. QKD is also attracting interest in national security, financial services and telecommunications. It offers a potential defence against future cyber threats, including those posed by quantum computers. DRDO noted that quantum communication offers fundamentally unbreakable encryption, making it a strategically important dual-use technology for military operations and sensitive civilian infrastructure.

Free-space QKD offers another advantage by eliminating the need for dedicated optical fibre networks. This can reduce deployment costs and logistical challenges in difficult terrain, remote operational areas and densely populated cities where laying fibre may prove impractical.

The Chandipur trial builds on India's wider efforts to develop indigenous quantum communication technologies. DRDO and its research partners have previously demonstrated long-distance fibre-based QKD links and free-space quantum communication systems.

The DRDO-Industry-Academia Centres of Excellence (DIA-CoEs) initiative also supports this research. DRDO has established 15 Centres of Excellence at leading institutions, including the Indian Institutes of Technology (IITs), the Indian Institute of Science (IISc) and several universities. These centres work on advanced defence technologies, including quantum systems, cybersecurity, advanced electronics and artificial intelligence.