Machines vendors plan to build

How many qubits each says it will have, and by when. Plans, not delivered machines. "Could break" marks a machine at least as big as the smallest attack we know of.

IBM

20281,080 physical qubits

2029200 logical qubits

Source

IonQ

2026100 physical / 12 logical qubits

202710,000 physical / 800 logical qubitsCould break: Finite-field DH (small 512-bit size only)

202820,000 physical / 1,600 logical qubitsAlso could break: 256-bit curves

2029200,000 physical / 8,000 logical qubitsAlso could break: RSA-2048, P-384, BLS12-381

20302 million physical / 80,000 logical qubits

Source

Quantinuum

2027100 logical qubits

Source