The Pauli-X Gate

The Pauli-X gate is the quantum NOT - one letter of the alphabet Kronos writes its quantum-chemistry and control circuits in.

What it does

X = [[0,1],[1,0]] swaps |0> and |1>, a 180-degree rotation about the X axis. It is the target operation inside a CNOT and a building block of bit-flip error correction.

Where it appears at Kronos

When Kronos maps a candidate material's electrons onto qubits for Hamiltonian simulation, X gates set the initial orbital-occupation state - which orbitals start filled - before the chemistry evolves. It is also the flip at the heart of the entangling gates that build those circuits.

Honest note

The gate is exact and real; the fusion-scale advantage that uses thousands of them is expected around the mid-2030s.