Quantum: Bharat Quantum Link
Bharat Quantum Link is a hybrid quantum-classical communication backbone for secure, long-distance command and control. The concept combines entanglement-assisted quantum key distribution with measurement-device-independent post-processing while coexisting with standard telecom infrastructure.
BQL-100 Variant Snapshot
A field-oriented architecture designed around trusted base nodes, an untrusted relay, quantum-safe key refresh, and coexistence with deployed fibre networks.
Product
Bharat Quantum Link
Architecture
Hybrid EA-MDI QKD
Fibre Coexistence
DWDM-ready
Base Separation
160-240 km target
Secure Key Rate
1-10 kbps target
Network Scale
>1000 km via relay chaining
System Architecture
Trusted Base Nodes
Narrow-linewidth pulsed lasers, LiNbO3 intensity and phase modulators, time-bin encoding, authenticated classical interfaces, and ruggedized processors running the QKD stack.
Untrusted Relay Node
Entangled photon source, Bell-state measurement workflow, cryogen-free SNSPD modules, FPGA-backed timing, and a rugged military rack architecture.
Classical Side Channels
Encrypted authenticated channels over separate DWDM lambdas, allowing quantum and operational traffic to coexist across existing fibre where feasible.
Military-Grade Features
- Security model designed for quantum-era adversaries.
- MDI architecture where the relay can remain untrusted.
- Containerized or bunkerized nodes for deployable links.
- Shock-resistant cryogen-free detector module pathway.
Implementation Roadmap
- Lab and short-haul field trials to validate hybrid EA-MDI protocol behaviour in deployed fibre.
- Military corridor pilots with integration planning for existing command network backbones.
- Scale and harden into a defence quantum ring with portable nodes for forward operating locations.
- Nationwide backbone expansion with possible satellite-ground hybrid QKD integration.
Quantum-secure command links