India's new defence technology deal is with a fridge that has to achieve a temperature of 20 millikelvin, or 0.02 degrees above absolute zero. It seems a bizarre indicator of a nation's strength. However, the machine which cools the quantum processor can be as important as the processor itself.

The Defence Research and Development Organisation on September 24 inked an agreement with Zero mK India, a start-up based at Alwar, to work on the development of a dilution refrigerator for quantum applications. It is the first high value agreement under a fund of ₹500 crore for deep tech projects. It's the total amount of the fund; the government has not disclosed the value of this particular contract. The work will be mentored and monitored by Solid State Physics Laboratory at DRDO. As of now, it's a development pledge and not a statement that India has built and qualified the machine.

The difference is important because quantum hardware is the target of lofty expectations before it's reliable. Superconducting qubits are sensitive to heat and require the extreme cold that is provided by a dilution refrigerator. According to IBM, which reveals that it is also working on quantum chips, its refrigerator cools the chips to 15 millikelvin. The Indian proposal of 20 millikelvin system thus satisfies a real requirement in the laboratories of India. But the headline temperature figure isn't the only one that will determine its usefulness: researchers will also need to know the cooling time, how well it retains its temperature, what the amount of heat that the chip and wiring can add is, and how reliable the system will be.

These Practical questions transform an instrument of science into an industrial challenge. They make use of precision machining, specialist materials, vacuum engineering, controls and painstaking assembly. Its purchaser requires installation service, upkeep, replacement components and service personnel that can identify a problem before they have to wait months for assistance from overseas. The ability to develop some of that capability at home could reduce research delays and provide Indian suppliers with experience in an exacting market. That commercial opportunity is possible, but there is no revenue prediction as a result of the agreement.

The project is also part of a much greater public investment. The eight-year budget of India's National Quantum Mission is at a whopping ₹6,003.65 crore. It is planned to increase computing targets from 20-50 physical qubits at the three-year stage to 50-1,000 at the eight-year stage. There are four hubs: Quantum computing, Quantum communication, Quantum sensing and Quantum materials. The refrigerator developed by the scientists could be most useful for programmes requiring ultracold equipment; it is not an answer to all branches of quantum technology.

There is a good strategy for India to develop critical research equipment. If a lab is reliant on one or two overseas suppliers for the machine at the heart of their experiments, delivery timelines, servicing and upgrades are to a large degree out of the lab's hands. If the home team has the ability to modify the equipment to suit their projects, then scientists will have greater flexibility. It could also be another supplier to universities and companies, if the Indian system turns out to be competitive on performance and support. This isn't a matter of declaring technological independence before trials are over, it's patient engineering.

The defence connection is also serious but needs to be taken care of. Besides sensing, precision timing, materials, and secure communication, Quantum computing is one of the elements of the National Quantum Mission. Some of those fields might be of useful for security. This isn't to say that this refrigerator alone can provide a deployable defence system. Its short-term utility is more fundamental: it could allow Indian teams to test equipment, and train experts and specialists on how to operate and maintain the infrastructure on which future systems rely.

Business policy should have the same longview. A startup that is building custom components must attract demanding customers who can tell them what works and what does not, and will be willing to pay for subsequent changes. DRDO can play that role here. If the machine is successful, research laboratories and private laboratories might create a larger market. In case it is not working out well, the results of the test should still be able to pinpoint the components and production techniques that need more effort. Neither one of them is more beneficial for learning than a formal declaration of success.

It is also possible to get mixed up with 2 milestones. A demonstration to 20 millikelvin would be a big step. A larger one would be one that could be delivered to researchers that they could use over and over again, with stable performance and timely service. The second is an essential component of India's quantum pursuits. Public reporting should, therefore, be based on the measurable results tested temperature, cooling capacity, reliability of operation, use of independent laboratories and the percentage of essential components which can be sourced from India.