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Konstantinos Karagiannis

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@KonstantHacker

Senior Director, Quantum Computing Services @Protiviti. Host, The Post-Quantum World protiviti.com/postquantum. Author, Post-Quantum Panic (Wiley Apr '27).
Manhattan, NY protiviti.com/postquantum Joined January 2013
602 Following 6.2K Followers 11K Posts

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Konstantinos Karagiannis Verified account @KonstantHacker
The qubit count to crack RSA keeps dropping. We're scheduling to get them back on The Post-Quantum World to discuss!
Alice & Bob Verified account @Alice__Bob Oct 29
Breaking RSA-2048 with 23,000 cat qubits. 🐈 In 3.14 days

This is the finding of our new paper, the latest resource estimate for Shor’s algorithm, the benchmark the whole field uses to compare quantum hardware 📄

The results are a record low for total quantum resources at this speed of execution, about 40 times fewer physical qubits than @GoogleQuantumAI 's Craig Gidney 2025 estimate. 🏁

RSA-2048 is the lock behind secure websites, banking and software updates 🔐 Shor's algorithm has been able to break it, on paper since 1994. Nobody has built the machine yet, but every year the estimate of how big it needs to be gets a little smaller.

In 2019, the best estimate was 20 million qubits. In 2024, ours was just under 100,000. Now 22,593, in 3.14 days. Yes, pi 🥧

Small isn't enough. Fast isn't enough. The new study optimizes for both. 😼

Bitcoin, Ethereum and most blockchains aren't secure either, about 30,000 qubits would be needed to crack a Bitcoin key in about an hour ₿ ⏳

How we got here, what it means for cryptography, and when it all converges, our CEO Théau Peronnin talks about it in the blog 👇

📝 Blog - alice-bob.com/blog/our-estim…

📄 Paper - eprint.iacr.org/2026/2665

Stay curious, more info coming soon 👀

#QuantumComputing #CatQubits #ShorsAlgorithm #PostQuantumCryptography #Cryptography #FaultTolerance #DeepTech
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