QNu Labs: The Private Indian Company Building Quantum-Safe Encryption, and Who It Works With

QNu Labs is a Bengaluru startup that sells quantum key distribution boxes, quantum random number generators and post-quantum software to the Indian Navy, the Army, BEL and BSNL. It isn't listed, but several of its partners are. Here's how its supply chain fits together.

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Oct 23, 2026 · 6 min read

Most of the companies we map trade on a stock exchange. QNu Labs doesn't. It is a private company in Bengaluru, started in 2016 at the IIT Madras Research Park, and it makes encryption hardware and software meant to keep working after quantum computers can break today's public-key cryptography. We're covering it anyway because its customers and partners include several listed Indian companies, and because the Indian government has put real money behind it.

The short answer

QNu sells three things. Armos is a quantum key distribution (QKD) system: two boxes joined by optical fibre that exchange encryption keys as single photons, so anyone tapping the line disturbs the photons and gets caught. Tropos is a quantum random number generator (QRNG), which produces the random numbers that encryption keys are made from. QShield, launched on World Quantum Day in April 2025, is a software platform built on NIST's post-quantum algorithms, with a VPN, messaging, file sharing and a key-management module (QHSM) on top.

The buyers so far are mostly Indian defence: the Indian Navy, the Indian Army and Bharat Electronics. BSNL is the main telecom partner. On the supply side, QNu runs its keys over other companies' fibre and network gear, including STL's optical fibre and routers and firewalls from Cisco, Fortinet and Adtran.

The QNu Labs supply chain map lays all of this out by tier.

Why anyone needs this now

Most internet encryption today relies on RSA and elliptic-curve math. A large enough quantum computer could break both. Nobody has built one yet, but there's a problem in the meantime that security people call "harvest now, decrypt later": an attacker can record encrypted traffic today and wait for the hardware to catch up. For military and diplomatic traffic that has to stay secret for decades, that risk exists already.

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Who does QNu Labs depend on?

QKD has a physical weak spot: a single photon can't travel very far down a fibre. Most point-to-point QKD links top out at around 100 to 200 km. To go further, you chain links through "trusted nodes." That makes the fibre itself part of QNu's supply chain.

In October 2025, STL and QNu announced tests over STL's 4-core multi-core fibre. QNu's QKD exchanged keys over 170 km while the same fibre carried 800 Gbps of ordinary traffic, and over 150 km alongside 1.8 Tbps. If quantum keys can share a cable with normal data, operators don't need to lay dark fibre just for QKD, and that's what would let this scale.

The longest run so far used the Army's own fibre. In November 2025, DST announced that a startup backed by the National Quantum Mission had demonstrated a QKD network spanning more than 500 km. The Indian Army's Southern Command built the test-bed fibre through the Rajasthan sector, with trusted nodes along the way. QNu has since said it has run a 1,000 km network. We could only find that figure on QNu's own site.

For customers who can't run fibre at all, QNu has a software product called Digital QKD. It uses QRNG keys and post-quantum algorithms over the ordinary internet. QNu's datasheet says it was tested on AWS in Singapore and on Microsoft Azure. It doesn't give you the physics-based guarantee that real QKD does, but it's much easier to deploy.

How QNu is funded

QNu raised a ₹200 crore Series A1 in September 2026, led by the National Quantum Mission and Speciale Invest, with the Sony Innovation Fund, Gaja Capital and Artha Ventures also in the round. That brings the total raised to about ₹375 crore. According to filed accounts reported by StartupTalky, revenue for the year to March 2025 was ₹40.5 crore, up 64%, with a net loss of ₹6.2 crore. It's still a small company, but its revenue is growing faster than most deep-tech hardware startups in India manage.

Who does QNu compete with?

The best-known QKD brand is Switzerland's ID Quantique. IonQ, a US-listed quantum computing company, bought a controlling stake in it in 2025, so it now has a large parent to pay for expansion. Toshiba runs commercial QKD networks with BT in London. China's QuantumCTek has the largest QKD base anywhere but sells very little outside China, which leaves room for an Indian supplier in India and friendly markets. On the software side, PQShield in the UK sells post-quantum crypto without hardware, and Australia's QuintessenceLabs is the closest match to QNu's mix of QRNG, key management and post-quantum crypto.

Where the chokepoints are

QNu's biggest dependency is on its customers. Most of its sales so far are to Indian defence, and defence procurement is slow and lumpy, so one delayed order can swing a year's numbers. On the technical side, QKD only works where there's fibre, so telecom partners like BSNL and fibre makers like STL decide how far the network can reach. The quantum part is QNu's own design. The fibre and switching gear around it belong to other companies.

If you follow Indian defence electronics, also look at our maps of Bharat Electronics and Data Patterns. Our India trending stocks roundup covers more listed Indian companies.

See it for yourself

The QNu Labs supply chain map shows its customers, fibre and network partners and competitors, with live prices for every listed company on it.

This post is for research only and is not investment advice. QNu Labs is a private company and its shares are not publicly traded. Facts are drawn from India's Department of Science and Technology, QNu Labs' published case studies and datasheets, and reporting by StartupTalky, The Quantum Insider, Inc42 and Indian Infrastructure, as of October 2026. Claims marked as QNu's own have not been independently verified.