Quantum error correction goes well beyond breakeven
Summary
Quantum computers need groups of linked qubits called logical qubits to detect and fix errors during calculations. Quantinuum has shown their new hardware can improve error correction significantly as the logical qubit size grows, making progress beyond the important breakeven point.Key Facts
- Quantum computers use logical qubits, which are groups of hardware qubits linked to find and correct errors.
- Adding more hardware qubits can help catch errors better, but it also raises the chance of errors because hardware qubits are imperfect.
- The breakeven point is when adding more qubits actually improves error rates rather than making them worse.
- Quantinuum’s latest hardware can scale logical qubits well beyond breakeven, improving error correction by about 10 times with each increase in size.
- Previous systems showed smaller improvements, often about twice better per increase in logical qubit size.
- Error correction codes organize how qubits are linked and measured to find errors, with "distance" showing how many errors can be handled at once.
- Better scaling means fewer increases in logical qubit size are needed to achieve very low error rates suitable for complex quantum algorithms.
- Quantinuum uses trapped ion technology for its quantum computers, which involves trapping charged atoms as qubits.
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