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IIT-Gandhinagar team tests open-air quantum link over five kilometres
Reported by Kunal Bhatia (Senior Writer) · The Hindu - Science ·
Reported by one source so far
Photo: Wikimedia CommonsUPDATE - follow-up to IIT-Gandhinagar scientists demo quantum link through 5.5 km of air: Indian scientists have tested a secure quantum communications link through open air across a distance of 5.56 kilometres.
Details of Test
The test took place on the night of September 27 and 28 between the Bhaskaracharya National Institute for Space Applications and Geo-informatics and IIT-Gandhinagar. Bengaluru-based firm QNu Labs supplied the equipment for the test.
Technology and Results
The setup achieved a quantum bit error rate of under 5 percent and generated secure key information at 230 to 260 bits per second. Scientists also combined quantum-key distribution with post-quantum cryptography to protect data against conventional and quantum computer hacks.
Context
This demonstration marks a major step forward from past Indian tests, building toward eventual satellite-based quantum links and nationwide secure networks.
What changed since yesterday
- India achieves first free‑space quantum‑key link over 5.56 km
Latest
IIT-Gandhinagar team tests open-air quantum link over five kilometres
ExplainerWhy this matters
What Happened
Scientists connected two locations in India using a free-space quantum-key distribution link over a distance of 5.56 km, relying on particles of light to generate shared encryption keys.
Why It Matters
Quantum-key distribution makes communication nearly impossible to intercept undetected because any attempt by an eavesdropper to measure the quantum states produces errors that the communicating parties can immediately spot. Combining this with post-quantum cryptography creates a robust defense against both standard and future quantum computing threats.
What Happens Next
These open-air ground tests serve as stepping stones toward deploying secure quantum links between ground stations and orbiting satellites, supporting goals set under India's National Quantum Mission.
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