The Square-Root-of-X Gate

The sqrt(X) gate is a half-NOT and, on much of the hardware Kronos evaluates, the actual physical single-qubit gate everything else is compiled from.

What it does

sqrt(X) is a 90-degree X-axis rotation; two of them make a full X. Combined with virtual Z rotations it generates any single-qubit gate.

Where it appears at Kronos

Because devices often expose sqrt(X) plus virtual-Z as the native set, sqrt(X) fidelity sets the single-qubit error floor for every Kronos materials or control circuit on that hardware.

Honest note

Single-qubit gates are already high fidelity; the harder two-qubit and error-correction layers gate the ~mid-2030s advantage.