Quantum lane: India rewires fibre for unhackable data

India's QKD-over-MCF breakthrough shows how next-gen telecom can be built quantum-secure, cost-effective, and sovereign—right from the infrastructure layer.

- JAIJIT BHATTACHARYA & ANUSHKA VERMA

In a world where sensitive data, from military communications to financial transactions, faces unprecedented cybersecurity threats, India has taken a significant step towards guaranteeing unhackable security. The country recently reached a watershed moment when it successfully demonstrated Quantum Key Distribution (QKD), a method of secure communication, using an advanced fibre optic cable known as Multi-Core Fibre (MCF).

But why is QKD critical for modern communication? The answer is simple: it ensures ultra-secure communication by harnessing the principles of quantum physics to exchange encryption keys, such as passwords, between two parties.

What sets QKD apart is its ability to detect any attempt at interception or tampering in real time. If an unauthorised party tries to access the key, the system immediately raises an alert.

This makes QKD a groundbreaking technology for ensuring sensitive information remains protected in the digital world. This technology is especially critical for sectors such as defence, banking, and healthcare, where protecting sensitive information is paramount.

This achievement, driven by the partnership between Sterlite Technologies Limited (STL) and the Centre for Development of Telematics (C-DOT), marks a significant step forward in advancing India’s technological autonomy and cybersecurity goals, closely aligned with the national initiatives of Atmanirbhar Bharat and Make in India.

MCF INNOVATION FOR QUANTUM SECURITY

India’s breakthrough lies in utilising MCF, an advanced fibre optic cable that functions like multiple lanes inside a single road, enabling more data to travel without requiring additional space. Traditionally, QKD required a dedicated fibre line. But India was able to demonstrate that quantum keys can be transmitted securely alongside regular data within the same cable, eliminating the need for separate infrastructure.