At its Build developer conference in San Francisco on Tuesday, Microsoft unveiled a range of AI models and officially launched its upgraded quantum computing chip, "Majorana 2." The company announced its ambition to build a commercially viable quantum computer by 2029. This new chip is the successor to a research device from a year ago that sparked significant debate within the quantum computing community.
Major technology companies are in a race to develop practical, operational quantum computers, believing the technology will revolutionize fields like finance, pharmaceuticals, and cybersecurity. While recent technical progress from some firms has been notable, no company has yet managed to move beyond research into real-world applications.
Microsoft is pursuing a distinct technical path known as topological qubits, which differs from the approaches taken by competitors like Google and IBM. The new Majorana 2 chip features 12 qubits, an improvement over the 8 in the previous version. However, Microsoft highlighted that the primary breakthrough is the extended lifetime of these qubits, which now exceed 20 seconds. In stark contrast, the qubits in the earlier chip disappeared in less than 12 milliseconds.
Additionally, Majorana 2 replaces the aluminum connectors from the first generation with a lead-based superconductor. Chetan Nayak, a Microsoft quantum hardware researcher and executive, stated, "Based on this rapid progress, we are accelerating our roadmap for a scalable, practical quantum computer. We have cut the timeline in half and are targeting this milestone for 2029."
Traditional computing relies on encoding information as either 0 or 1, while qubits represent a probability of both states simultaneously. This property theoretically allows quantum machines to solve complex problems beyond the reach of classical computers. The challenge lies in the qubits themselves: they require an ultra-cold, precisely controlled environment, are prone to errors during computation, and have extremely short lifespans.
Microsoft's approach centers on particles named after Italian physicist Ettore Majorana, aiming to create topological qubits that are inherently more error-resistant than other technologies. It's important to note that Microsoft's quantum research journey has not been without hurdles. Following the release of the first Majorana chip last year, some quantum researchers raised doubts, arguing that the chip and related papers did not conclusively demonstrate the claimed "technological leap." Furthermore, some earlier quantum research funded by Microsoft was retracted due to controversy.
Microsoft quantum researcher Zulfi Alam noted that the company continues to collaborate with the Defense Advanced Research Projects Agency (DARPA) to assess its progress. "DARPA has the best scientists in the world, and they are reviewing our program weekly, diving deep into the details of our work," he said in a pre-launch briefing. "We have given them all the data. All of it."
He added, however, that Microsoft prefers to share technical details with government-affiliated researchers who are not developing competing quantum machines. "From a business perspective, it doesn't make sense to give all the data to a lab or a competitor for replication," Alam said.
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