Free-Space Quantum Secure Communication: India’s Quantum Jump

Ayndri
Ayndri
Research Analyst - Policy & Advocacy, CyberPeace
PUBLISHED ON
Jun 25, 2025
10

Introduction

India is making strides in developing its own quantum communication capabilities, despite being a latecomer compared to nations like China and the US. In the digital age, quantum communication is gradually becoming one of the most important technologies for national security. It promises to transform secure data exchange across government, financial, and military systems by enabling unhackable communication channels through quantum concepts like entanglement and superposition.  Scientists from the Defence Research and Development Organisation (DRDO) and IIT Delhi recently demonstrated quantum communication over a distance of over one kilometre in free space. One significant step at a time, India's quantum roadmap is beginning to take shape thanks to strategic partnerships between top research institutes and defence organisations.

Recent Developments

  • In February 2022, by DRDO and IIT Delhi, a 100 km Quantum Key Distribution (QKD) link was established between Prayagraj and Vindhyachal using pre-existing commercial-grade optical fibre, with secure key rates of up to 10 kHz. This proved that using India's current telecom infrastructure to implement quantum-secure communication is feasible.
  • Scientists at DRDO finished testing a 6-qubit superconducting quantum processor in August 2024, showing complete system integration by submitting quantum circuits through a cloud interface, running them on quantum hardware, and updating the results. 
  • A free-space QKD demonstration over over 1 km was conducted in June 2025, with a secure key rate of approximately 240 bits/s and a Quantum Bit Error Rate (QBER) of less than 7%. A crucial step towards satellite-based and defence-grade secure networks, this successful outdoor trial demonstrates that quantum-secure communication is now feasible in actual atmospheric conditions.
  • India is looking to space as well. Since 2017, the Raman Research Institute (RRI) and ISRO have been collaborating on satellite-based QKD, with funding totalling more than ₹15 crore. In 2025, a specialised QKD-enabled satellite called SAQTI (Secured Applications using Quantum and optical Technologies by ISRO) is anticipated to go into orbit. The initiative's foundation has already been established by ground-based quantum encryption trials up to 300 meters.
  • In India, private companies such as QNu Labs are assisting in the commercialisation of quantum communication. QNu, which was founded at IIT Madras, has created the plug-and-play QKD module Armos, the quantum random number generator (QRNG)Tropos, and the integrated platform QShield, which combines QKD, QRNG, and post-quantum cryptography (PQC). 

Where India Stands Globally

India is still in its infancy when compared to China's 2,000 km Beijing–Shanghai QKD network and its satellite-based communication accomplishments. Leading nations like the US, UK, and Singapore are also ahead of the curve, concentrating on operationalising QKD trials for government systems and incorporating post-quantum cryptography (PQC) into national infrastructure.

However, considering the nation's limited prior exposure to quantum technologies, India's progress is noteworthy for its rapid pace and indigenous innovation.

Policy Challenges and Priorities

  • Strong policy support is required to match India's efforts in quantum communication. The standardisation of PQC algorithms and their incorporation into digital public infrastructure have to be major priorities.
  • Scaling innovation from lab to deployment through public-private partnership
  • Accelerating satellite QKD to establish a secure communications ecosystem owned by India.
  • International standards compliance and worldwide interoperability for secure quantum protocols.

Conclusion

India has made timely strides in quantum communication, spearheaded by DRDO, IITs, and ISRO. Establishing unbreakable communication systems will be essential to national security as digital infrastructure becomes more and more integrated into governance and economic life. India can establish itself as a significant player in the developing quantum-secure world with consistent investment, well-coordinated policy, and international collaboration.

References

PUBLISHED ON
Jun 25, 2025
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