India successfully tests free-space Quantum Key Distribution over 5.56 km

[indo17787]

India has successfully demonstrated its first free-space Quantum Key Distribution (QKD) link over a distance of 5.56 km, marking a step towards building quantum-secure communication networks that could eventually support longer-distance and satellite-based systems.

The field trial was carried out by QNu Labs in collaboration with the Bhaskaracharya National Institute for Space Applications and Geo-informatics (BISAG-N) and IIT Gandhinagar on the night of September 27-28, the Ministry of Electronics and Information Technology said in a release on Saturday.

Technical Achievement and Performance​

The secure quantum communication channel was established between BISAG-N and IIT Gandhinagar using QNu Labs’ Pointing, Acquisition and Tracking system.
According to the ministry, the trial achieved a stable Quantum Bit Error Rate of below 5 per cent and generated secure encryption keys at a rate of 230-260 bits per second. These keys were then integrated with BISAG-N’s post-quantum cryptography-enabled Vedic Kavach platform, allowing successful end-to-end encryption and decryption of test messages.

Significance and Future Applications​

The demonstration is significant because free-space QKD transmits secure cryptographic keys through optical channels in open air rather than relying only on fibre networks, making it relevant for future long-distance and satellite-based quantum communication systems.

Integrated Security Architecture​

The trial combined two layers of security - QNu Labs’ hardware-based QKD device Armos over free-space optical channels and BISAG-N’s Vedic Kavach software-based post-quantum cryptography system with quantum random number generation. The ministry said the integrated architecture is designed to maintain security even if the physical quantum communication channel is temporarily unavailable.

Expert Commentary​

“The integration of Vedic Kavach with QNu Labs’ QKD technology marks a significant step towards practical quantum-resilient communication systems,” Dr Vinay Thakur, Director General of BISAG-N, said.

QNu Labs Co-founder and CEO Sunil Gupta said the successful 5.56-km demonstration could support the development of longer-distance quantum-secure networks and satellite-based quantum communication.

Cmde Manish Tripathi (Retd.), In-charge, ISTF, IIT Gandhinagar, said the trial provides a field environment for advancing practical quantum communication technologies by bringing together academic research, indigenous technology and real-world testing.

Building a Quantum-Resilient Future​

The government said the trial provides a foundation for strengthening India’s secure communication infrastructure and developing systems capable of addressing emerging cybersecurity risks in the quantum era.

BISAG-N is an autonomous scientific society under the Ministry of Electronics and Information Technology and works in areas including satellite communication, space technology applications and geo-informatics. @Nimble

 

[r3alist]

Sounds impressive, what is it

 

[Vikramaditya1]

Sounds impressive, what is it

Nothing much just sending encryption keys using light (photons) sent through 5.56 km of open air, with eavesdropping being detectable. Like a mail with extra checks to see if someone opened the mail.

 

[r3alist]

This is future tech

 

[mythbuster]

Nothing much just sending encryption keys using light (photons) sent through 5.56 km of open air, with eavesdropping being detectable. Like a mail with extra checks to see if someone opened the mail.

It's an achievement , glad you are not bragging about it

 

[indo17787]

This is future tech

And it's not limited to that role either. India put it through terrestrial communication trials this year as well.

https://www.ndtv.com/india-news/india-successfully-demonstrates-1-000-kilometre-quantum-communication-network-using-homegrown-technology-11338613

 

[D00D00]

Only 5.56km? The Chinese set a world record of maintaining a quantum communication link of 12900km. That's over 2300 times what the Indians have managed.

China sets world record for quantum secure communication​

A team of Chinese quantum scientists has sent two encrypted photos via a satellite connection.​

China is taking a new step in the global race towards a fully secure internet. A team of Chinese quantum scientists sent two encrypted photos via a satellite connection between Jinan, China, and the University of Stellenbosch in South Africa. Covering a distance of 12,900 kilometers, this is a new world record for quantum-secured communication via satellites.

According to a recent publication in the leading scientific journal Nature, this experiment surpasses the previous record of 1,100 kilometers, which was set five years ago by the same Chinese team. At the time, it was already clear that China had a head start on the West in the development of quantum communication.

2027: millions of users​

China aims to offer a commercial service for secure satellite connections by 2027, aimed at millions of users. Their lightweight, mass-produced satellites and associated ground equipment give the country a significant technological and industrial advantage.

The only effective security method​

Quantum encryption is seen as the only security method that can withstand future quantum computers, which are expected to be able to break through traditional encryption. That is why China and the European Union invest in quantum communication. In quantum communication, the sender and receiver exchange unique encryption keys that cannot be intercepted, not even by quantum computers.

Developments in Europe​

China seems to be leading the way. However, the European Union is also investing in the SAGA (Security And Global Access) satellite system, an initiative to set up a secure quantum communication network within Europe. Within this project, the EU is working together with various member states and research institutions to integrate technologies such as quantum key distribution (QKD) into the European communication network. In addition to the development of satellites, SAGA also includes the construction of a terrestrial quantum network, so that both space- and ground-based infrastructure can be used for secure communication.

New project lays foundation for quantum internet via space​

TNO will investigate the role space can play for quantum information networks.