A message encrypted today could still expose confidential information years later. Quantum-safe communication addresses that risk through security methods designed to withstand attacks from sufficiently powerful future quantum computers.
On 28 October 2026, the Department of Telecommunications (DoT) brought that challenge into India’s 6G discussions at Bharat Mandapam, New Delhi. Its “Intelligent Networks and Quantum Communication” session at ESTIC 2026 examined how future telecom infrastructure should protect information while supporting AI-driven networks.
The discussion concerned research priorities and deployment pathways. It did not announce a nationwide quantum-secure mobile service.
Key Highlights
- DoT’s ESTIC session linked 6G research with quantum-safe security.
- India has demonstrated a 5.56 km free-space quantum key distribution link.
- Telecom migration requires changes across equipment and software.
Quantum-Safe Communication Starts With Two Different Approaches
The immediate concern centres on public-key cryptography, which helps establish secure connections and authenticate identities. Sufficiently capable quantum computers could defeat widely used public-key methods, creating risks across telecom infrastructure.
Two approaches feature in India’s work:
- Post-Quantum Cryptography (PQC) uses mathematical algorithms on conventional computers to resist both classical and quantum attacks.
- Quantum Key Distribution (QKD) uses quantum signals to establish shared secret keys and detect certain interception attempts.
These approaches involve different equipment and deployment choices. PQC does not require a quantum computer; QKD needs specialised physical systems.
NIST’s first three final PQC standards, released on 13 August 2024, cover key establishment and digital signatures. Their availability gives network developers standards to implement while India works through migration and testing requirements.
What India’s Latest 6G Discussion Actually Covered
At ESTIC, speakers connected network automation with the protection of confidential information. Easiofy Solutions presented medical imaging over quantum-secure healthcare networks, while Signalchip Innovations discussed indigenous radio-access chips and post-quantum security.
Medical imaging gives the security discussion a practical setting: a fast connection alone does not establish how a network protects patient information.
The accompanying vision document identified a national quantum-secure backbone among its priorities, alongside indigenous 6G technologies and AI-driven cyber defence. Those priorities describe the proposed direction of development, rather than evidence of nationwide deployment.
PIB’s Ministry of Communications account also shared the session announcement on X.
Indian Trials Show Progress, With Specific Limits
A government announcement on 3 October reported a 5.56 km free-space QKD demonstration involving QNu Labs, BISAG-N and IIT Gandhinagar. The trial took place overnight on 27–28 September.
Researchers generated secure keys at 230–260 bits per second, with a quantum bit error rate below 5%. They integrated those keys with BISAG-N’s PQC-enabled Vedic Kavach platform to encrypt and decrypt test messages.
That rate measures secure-key generation. Reading it as a mobile download speed would misrepresent the result.
C-DOT has also unveiled 14 indigenous quantum products. Its 31 August announcement listed equipment for different network layers:
| Product | Announced Capability |
| Q-MAHASETU | Layer 2/3 encryption, up to 40 Gbps |
| Q-AMOGH | Optical Layer 1 encryption, up to 200 Gbps |
These are announced product throughputs. They do not establish how many commercial operator links currently use the equipment.
What Telecom Operators Need To Prove Next
The work now extends beyond selecting an algorithm. TEC’s migration guidance describes migration across cryptographic libraries, network equipment and key-management systems, including infrastructure that remains operational for many years.
For an operator assessing readiness, two questions deserve attention:
- Which systems use vulnerable cryptography, and which protect information that must remain confidential for years?
- Will replacement methods work with existing equipment and other vendors’ systems under operational conditions?
On 8 October, communications minister of state Chandra Sekhar Pemmasani called for real operator trials, including quantum-safe encryption on critical links and QKD wherever economically justified.
Follow DoT’s deployment announcements and TEC’s migration guidance for evidence of operational progress. A successful demonstration and a service operating reliably at scale answer different questions.
FAQs
Does quantum-safe communication require a quantum computer?
No. Post-quantum cryptography runs on conventional computing systems. Quantum key distribution uses specialised quantum equipment, so the hardware requirements depend on the approach a network adopts.
Why protect data before powerful quantum computers arrive?
Attackers could collect encrypted information now and attempt decryption later. Records that must remain confidential for years create a reason to begin migration before that capability exists.
Has India launched a nationwide quantum-secure 6G service?
The 28 October DoT release describes research discussions, technology showcases and future priorities. It does not announce a nationwide quantum-secure 6G service or consumer subscription offering.
Does the 230–260 bps trial figure describe internet speed?
It describes secure-key generation during the reported QKD trial. The researchers used those keys for encryption; the figure does not describe consumer broadband or mobile download throughput.
Will QKD remove every cybersecurity risk?
No. NIST identifies equipment imperfections and implementation loopholes in QKD systems. Quantum-based protection still requires secure hardware and careful implementation; the label alone cannot establish complete security.
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