// SCIENCE

// Quantum Mechanics + Computing = Quantum Computing

// When reality kicks in

// PHASE FLIPS

Errors happen 10,000 times a second currently. No wonder quantum computers can’t compute very well yet.

Luckily, error correction codes track errors each time they happen, retrieving the quantum information lost through decoherence to create an error-corrected, logical qubit.

Quantum error correction works by redundancy, extending the quantum information over several physical qubits.

Redundancy means hundreds of physical qubits for a single error-corrected logical qubit.

To build a useful quantum computer we need hundreds of such logical qubits…

But…

We deal only with one class of errors, the phase-flip, reducing quantum error correction to one dimension. Simple.

Thanks to this, a logical qubit could be assembled using as few as 5 physical cat qubits.

Such a low overhead helps us lead the race to building a fault-tolerant quantum computer.