In a major technological breakthrough, C-DOT, in collaboration with Sterlite Technologies Limited (STL), has successfully tested India’s first Quantum Key Distribution (QKD) transmission over a 4-core Multi-Core Fibre (MCF). This achievement marks a crucial milestone towards building quantum-secured communication networks in India.
Key Highlights
Quantum Transmission Setup:
- Quantum signals were transmitted through one core of the MCF.
- The other three cores simultaneously carried high-speed user data.
- A stable QKD link was established over a distance of over 100 km, showcasing the stability of quantum communication even with concurrent high-capacity classical traffic.
Technology Used:
- Multi-Core Fibre (MCF) enables multiple data channels within a single optical fibre strand, reducing space and infrastructure costs.
Importance:
- Reduces the cost and complexity of deploying quantum-secured communication.
- Ensures simultaneous transmission of quantum and classical data without compromising the integrity of quantum signals.
- Strengthens India’s position in quantum communication and optical networking innovations.
Centre for Development of Telematics (C-DOT)
- India’s premier telecom R&D centre under the Department of Telecommunications (DoT), Ministry of Communications.
- Key developer of industry-grade QKD systems, certified by the Telecommunication Engineering Centre (TEC).
- A leading player in building India’s quantum communication ecosystem.
Sterlite Technologies Limited (STL)
- A global provider of integrated digital networks, specializing in optical fibre manufacturing and network design.
- Operates 10+ global manufacturing plants, serving customers across 100+ countries.
- Pioneer in Space Division Multiplexing via 7-core and 4-core MCF, enabling ultra-high data transmission capacities.
About Multi-Core Fibre (MCF) Technology
Allows multiple independent data transmissions within a single fibre.
Advantages:
- Saves physical space and infrastructure costs.
- In QKD, it physically separates quantum and classical signals, allowing secure and simultaneous communication over a single cable.
Significance for India:
- Strengthens India’s movement towards digitally sovereign and secure communication networks.
- Supports advancements in national security, finance, defence communications, and critical infrastructure.
- Demonstrates India’s leadership in quantum technology, alongside global advancements in AI, blockchain, and machine learning security.
About Quantum Key Distribution (QKD)
Definition: A secure communication method using quantum mechanics to distribute encryption keys securely between two parties.
How It Works:
- Sends photons (light particles) over fibre optic cables.
- Each photon encodes qubits (binary information) based on their quantum state.
Types:
- Entanglement-based protocols: Utilizes entangled quantum states.
- Prepare-and-measure protocols: Sender prepares and transmits quantum states for receiver to measure.
Benefits:
- Highly secure- can detect any eavesdropping attempts.
Limitations:
- High infrastructure costs.
- Requires specialized equipment.
- Integration challenges with existing networks.