METHODS AND SYSTEMS FOR HIGH-FIDELITY ZZ-ROTATION OF QUBITS

Abstract

A method for performing a ZZ-rotation quantum gate acting on two qubits having an XX coupling and corresponding resonance frequencies. The method includes applying twice the following pulses: rotation pulses, and echo pulses. In each application of pulses, to each of the two qubits, a corresponding rotation pulse is applied. The rotation pulse has a corresponding phase, has a corresponding amplitude, and has a driving frequency ω{circumflex over ( )}((i)) distinct from each of the resonance frequencies, so that each of the two qubits is having a corresponding detuning Δ_0,1{circumflex over ( )}((i)). The echo pulse is commuting with a Pauli-ZZ operator associated with the two qubits. The echo pulse is applied so as to control a magnitude of any one of: XX+θ(Δ_0{circumflex over ( )}((i)) Δ_1{circumflex over ( )}((i)))·YY rotation, and XY−θ(Δ_0{circumflex over ( )}((i)) Δ_1{circumflex over ( )}((i)))·YX rotation. In each application of pulses, the echo pulse is applied after the rotation pulse.

CPC Classifications