French quantum computing startup Alice & Bob says it can factor RSA-2048 in as fast as three days using fewer than 23,000 physical qubits, roughly 40 times fewer than Google Quantum AI’s 2025 estimate of one million qubits. The company attributes the reduction to a cat-qubit architecture that suppresses errors at the hardware level, more efficient error-correcting codes and an optimized version of Shor’s algorithm. In the same study Alice & Bob estimates that 30,000 qubits could break elliptic-curve cryptography used by Bitcoin and Ethereum in about an hour. The preprint has not been peer-reviewed, and whether its cat qubits can perform and scale in real-world operations remains uncertain. 1
Published by Bank Info Security · On GETSECURE.ai ·
Alice & Bob Claims New Benchmark for Breaking RSA-2048 in Days
⚠️ Critical Alert
Why This Matters
You should check whether any long-term confidential data you protect with RSA-2048 or elliptic-curve keys could be exposed to a quantum attack and consider quantum-safe remediation.
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References
- Bank Info Security. (2026, October 31). Alice & Bob Claims New Benchmark for Breaking RSA-2048 in Days. Bank Info Security. https://www.bankinfosecurity.com/alice-bob-claims-new-benchmark-for-breaking-rsa-2048-in-days-a-33268
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