Blog · From the JoS QUANTUM team

Notes on quantum, in the real world.

Research, engineering write-ups, and perspectives on putting quantum algorithms to work in finance, security, and energy.

Terminal-style estimate for RSA-2048: ~6,190 logical qubits, ~2.6 billion Toffoli gates, ~20 million physical qubits, ~8 hours runtime, projected breakable 2039–2041
10 Jul 2026 · Demo walkthrough

Inside the Shor demo: what it takes to break an RSA key

A guided tour of our interactive Shor estimator — what each number means (logical qubits, Toffoli gates, physical qubits, runtime), the scaling laws behind them, and how a key size becomes a projected break-year.

Chart: physical-qubit estimates to break RSA-2048 and ECC-256 collapsing across successive studies from 2019 to 2026
15 Jul 2026 · Research note

Why quantum error correction — not qubit count — decides when RSA and ECC fall

RSA and ECC will fall to how efficiently Shor’s algorithm compiles into fault-tolerant gates — not raw qubit count. A look at the collapsing resource estimates for RSA-2048 and ECC-256.