Bengaluru-based quantum startup QNu Labs Pvt. Ltd., supported by the Department of Science and Technology (DST) under India's National Quantum Mission (NQM), successfully demonstrated India's first 500 km Quantum Key Distribution (QKD) network. The achievement was announced at ESTIC 2025 in the presence of senior government officials including the Principal Scientific Adviser to the PM. The QKD network was deployed over existing optical fibre infrastructure, achieving 60% infrastructure efficiency compared to global standards. QNu's Armos™ QKD system delivers 150–200 km point-to-point range — nearly double the global industry standard. Notably, the Indian Army's Southern Command contributed its optical fibre network in the Rajasthan Sector for the test-bed. This milestone positions India alongside China, the US, and EU in building quantum-secure communication networks, validating India's Aatmanirbhar Bharat vision in cutting-edge technology.
India Demonstrates First 500 km Quantum Key Distribution (QKD) Network Under National Quantum Mission
Bengaluru-based quantum startup QNu Labs Pvt. Ltd., supported by the Department of Science and Technology (DST) under India's National Quantum Mission (NQM), successfully demonstrated India's first 500 km Quantum Key Distribution (QKD) network. The achievement was announced at ESTIC 2025 in the presence of senior government officials including the Principal Scientific Adviser to the PM. The QKD network was deployed over existing optical fibre infrastructure, achieving 60% infrastructure efficiency compared to global standards. QNu's Armos™ QKD system delivers 150–200 km point-to-point range — nearly double the global industry standard. Notably, the Indian Army's Southern Command contributed its optical fibre network in the Rajasthan Sector for the test-bed. This milestone positions India alongside China, the US, and EU in building quantum-secure communication networks, validating India's Aatmanirbhar Bharat vision in cutting-edge technology.
Key facts
- QNu Labs demonstrated India's first 500 km Quantum Key Distribution network under National Quantum Mission.
- QNu's Armos QKD system delivers 150–200 km range — nearly double the global industry standard.
- Network deployed over existing optical fibre infrastructure with 60% infrastructure efficiency.
- Indian Army's Southern Command contributed optical fibre network in Rajasthan for the test-bed.
- Announced at ESTIC 2025 in presence of PM's Principal Scientific Adviser.
- Positions India alongside China, US, and EU in quantum-secure communication networks.
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Source: DST.gov.in / Tribune India / KNN India
Frequently asked questions
What is Quantum Key Distribution (QKD) and why is it considered quantum-secure?
Quantum Key Distribution (QKD) is a cryptographic technique that uses the principles of quantum mechanics to distribute encryption keys. Any interception attempt disturbs the quantum states of photons, making eavesdropping detectable. This makes QKD theoretically unbreakable by classical or quantum computers, unlike conventional encryption methods.
Who developed India's first 500 km QKD network and under which mission was it supported?
India's first 500 km QKD network was developed by QNu Labs Pvt. Ltd., a Bengaluru-based quantum startup. The achievement was supported by the Department of Science and Technology (DST) under India's National Quantum Mission (NQM), which was approved in 2023 with a ₹6,003 crore outlay.
What is the significance of QNu's Armos QKD system compared to global standards?
QNu's Armos QKD system achieves a range of 150–200 km, which is nearly double the global industry standard of around 80–100 km. The 500 km demonstration was achieved using multiple Armos nodes over existing optical fibre, attaining 60% infrastructure efficiency compared to dedicated QKD fibre setups.
What role did Rajasthan play in the 500 km QKD network demonstration?
The Indian Army's Southern Command contributed its optical fibre network in Rajasthan as the test-bed for the 500 km QKD demonstration. This makes Rajasthan directly relevant to India's quantum-secure communication milestone and highlights the dual-use (defence + civilian) potential of QKD infrastructure.
What is India's National Quantum Mission (NQM) and how does the QKD milestone relate to it?
India's National Quantum Mission (NQM) was approved in 2023 with an outlay of ₹6,003 crore for 2023–31. Its goals include developing quantum computers, quantum communication networks, quantum sensing, and quantum materials. The 500 km QKD demonstration is a direct output of NQM's quantum communication vertical, placing India alongside China, the US, and the EU in this strategic technology.
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