Fig. 5
From: Two-axis quantum control of a fast valley qubit in silicon
Quantum process tomography for valley (Z) rotations. a, c, e Measured process matrices based on a fit of state tomography data. The color of each matrix element bar denotes complex phase: blue is real, red is imaginary. b, d, f Ideal process matrices for comparison. Calculated fidelities \(\cal{F} = \mathrm{Tr}( \chi _{\mathrm{ideal}}\chi)\) are \({\cal{F}}_{\pi /2} = 0.85 \pm 0.02\), \({\cal{F}}_{\pi} = 0.79 \pm 0.02\), and \({\cal{F}}_{2\pi } = 0.93 \pm 0.01\)
