Extended Data Fig. 1: Calibration of accumulated phases during logical \(\sqrt{{\rm{iSWAP}}}\) gate.
From: Logical multi-qubit entanglement with dual-rail superconducting qubits
a, Calibration of accumulated single qubit phase during \(\sqrt{{\rm{iSWAP}}}\) gate. The top panel is the pulse sequence and the bottom panel is the measured data. The measured data are the population of \({\left|00\right\rangle }_{{\rm{L}}}\) (\({\left|01\right\rangle }_{{\rm{L}}}\)) as a function of the rotation angle of the second π/2 pulse with the logical qubit first initialized to \({\left|00\right\rangle }_{{\rm{L}}}\) (\({\left|01\right\rangle }_{{\rm{L}}}\)). Solid lines are sinusoid fit. The arrows mark the determined calibrated phases. b, Calibration of the relative phase δ during \(\sqrt{{\rm{iSWAP}}}\) gate. The top panel is the pulse sequence and the bottom panel is the measured data. The measured data are the off-diagonal term of the density matrix, \({\rho }_{{\left|01\right\rangle }_{{\rm{L}}}{\left\langle 10\right|}_{{\rm{L}}}}\), as a function of the relative phase δ used in the four calibration pulses Rz(θi). Solid lines are sinusoid fit. The arrow marks the determined calibrated phase.
