India has successfully conducted a 5.56-kilometre Free Space Quantum Key Distribution (QKD) trial, marking an achievement in quantum communication and digital security. The trial was conducted jointly by QNu Labs, BISAG-N and IIT Gandhinagar, with secret keys generated through laser beams.
The QKD trial was conducted on the night of September 27-28 between BISAG-N and IIT Gandhinagar. The test demonstrated wireless quantum communication over a distance of 5.56 kilometres using laser beams through the air.
During the trial, QNu Labs' specialised tracking system also played an important role. The Error Rate recorded during the trial was below 5%. The system generated secure Secret Keys at a rate of 230 to 260 bits per second. These Keys were used to securely transmit Test Messages from one location to another.
Quantum Key Distribution, or QKD, is a technology used to securely share an Encryption Key between two parties. The key is used to protect messages during communication.
A key feature of QKD is that an attempt by a third party to obtain or interfere with the Quantum Key can cause changes in the communication system that can be detected. This can alert the relevant parties to potential tampering.
Quantum Communication is therefore being developed as a technology for secure digital communications. However, QKD does not mean that a hacker or Quantum Computer can never compromise a system under any circumstances. QKD primarily focuses on secure Key Distribution, while other security measures are also required for comprehensive cybersecurity.
The trial used a two-level security arrangement. At the Hardware level, QNu Labs' Armos device was included, while BISAG-N's ‘Vaidik Kavach’ platform was used at the Software level.
The dual-layer arrangement is intended to strengthen data security during Free Space Communication. The system has also been designed to maintain data security if the communication link is disrupted because of adverse weather or other conditions.
The development of Quantum Computing could create new challenges for existing Encryption Systems in the future. In this context, technologies such as QKD can play a role in providing secure Communication Keys.
The successful trial in India could support the development of secure Wireless Communication Networks for Banking, Defence and sensitive government data. Such technology could also be used in the future to establish secure Quantum Communication Links from the ground to satellites.
The trial represents a step towards advancing India's indigenous Quantum Security capabilities.
