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Fast adiabatic qubit gates using only<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>σ</mml:mi><mml:mi>z</mml:mi></mml:msub></mml:math>control
A controlled-phase gate was demonstrated in superconducting Xmon transmon qubits with fidelity reaching 99.4%, relying on the adiabatic interaction between the $|11\ensuremath{\rangle}$ and $|02\ensuremath{\rangle}$ states. Here we explain the theoretical concepts behind this protocol, which achieves fast gate times with only ${\ensuremath{\sigma}}_{z}$ control of the Hamiltonian, based on a theory …