Dear Quantum Computing Industry
Amit HagarLetters to an industry that does not always want to read them. A physicist on what quantum computing is, what it is not, and what the press releases leave out.
| Platform |  | Pricing | Only free issues | Publishes | Daily |
|---|---|---|---|---|---|
| Issues | 45 | Subscribers | Read | amithagar.substack.com |
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Latest Issues
Recent posts by this newsletter. Browse the email archive.
A Rude Lab or a Polite Simulation?
Both papers from the last two posts are acts of imagination. Google imagines what happens when you run the biggest error-correcting code you can fit on a 105-qubit chip. IonQ imagines what happens when you build a 2,514-qubit trapped-ion ma...
Better Look Under the Hood. You Might Find a Walking Cat
Last time, I contrasted Google’s Willow paper with IonQ’s Walking Cat blueprint and suggested that neither amounts to the cryptographic threat announced in the press. This is the follow-up. Here we do the numbers.
IonQ’s Cat Walks, Google’s Willow Bends, and Cryptography is Fine, Thank You
In February 2025, Google Quantum AI published Quantum Error Correction Below the Surface Code Threshold in Nature. The paper reports that the 105-qubit Willow processor ran an error-correcting code large enough to keep an error-corrected qu...
The Universe That Would Not Cooperate
The threshold theorems for fault-tolerant quantum computing that saved the field from extinction are mathematically airtight. Also, they describe a universe that does not exist.
Authors
The writers behind this newsletter.
A scientist and lately also a farmer (olives, grapes, capers). Trained in physics and philosophy. A researcher who follows questions wherever they lead — quantum computing, biomedicine, commodities markets, screenwriting.
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