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Reality Checks
The claim, what was actually shown, what it doesn't show, and why it matters.
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Microsoft's Majorana chips: has it built a topological qubit?
Microsoft says its Majorana chips use a new kind of qubit that resists errors by design, and that a scalable machine could arrive by 2029. The underlying physics is still disputed, and no working topological qubit operations have been published.
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Google's "Quantum Echoes": the first verifiable quantum advantage?
Google says its Willow chip ran a physics calculation about 13,000 times faster than the best classical method, and that the answer can be checked. The result is real and peer-reviewed. The "verifiable" part hasn't been verified by anyone else yet.