Quantum challenge: On IIT-DRDO demonstration of quantum key-distribution scheme

Scientists from IIT-Delhi and the DRDO recently demonstrated a key advance in quantum cybersecurity that stands to revolutionise how the world will communicate in the future. The world's secrets are currently stored and communicated via channels that are protected by difficult mathematical problems. Over the years, an increasing amount of computing power available to certain actors has forced these problems to become difficult and nigh-uncrackable. The imminence of quantum computing requires this paradigm to change because quantum computers can (at least on paper) solve problems currently out of reach of the most powerful conventional supercomputers. Quantum cybersecurity is one prong of this change, promising to protect communication channels irrespective of the computing power available to malicious actors. The IIT-Delhi and DRDO team successfully demonstrated a quantum key-distribution scheme through one kilometre of free space on the institute's campus. Such a technology allows two individuals (or stations) located a kilometre apart to securely access messages they send each other. If an eavesdropper tries to intercept any message, instantaneous changes in the keys the individuals use to decrypt the messages will reveal the channel has been compromised, and in a way that the eavesdropper cannot prevent. If scaled up to include satellites, the technology could allow stations anywhere in India to exchange information through a quantum network without fear of being compromised.
Herein lies the rub. Quantum communications is one of the four themes of the National Quantum Mission, approved in 2023 with an outlay of ₹6,003 crore until 2031. Many of the same problems assailing fundamental research in India have already beset research under the Mission, however. A small fraction of the outlay has been disbursed thus far even as venture capital flow into startups remains trivial. Scientists have complained that just-in-time funding, absence of single-window clearances, and documentation requirements have increased the duration of projects. There are persistent foreign hardware and software dependencies: materials required for specific use-cases, such as cryostats and sensors, need to be fabricated abroad while most quantum software stacks are currently implemented by multinational companies. Government pay does not match global offers and lack of timely access to resources has forced researchers to accept short-term contracts and rent equipment. In fact, India's commitment, itself down from the ₹8,000 crore announced in 2020, is dwarfed by those of the U.S. and China, which are five- and 20-times higher, respectively. If the demonstration at IIT-Delhi is to scale, the government cannot simply 'clip on' scientific talent and technological and economic opportunity to existing infrastructure. Administrative reform is essential.

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