ZZ Reduction via Third-Order Dispersive Interactions

Described is a method for reducing parasitic ZZ interactions using third-order dispersive interactions and its implementation in superconducting qubits. In one example embodiment, a system comprises a first fluxonium qubit; a second fluxonium qubit; and a resonant circuit coupled to both the first fluxonium qubit and the second fluxonium qubit according to respective coupling strengths, wherein interactions between the resonant circuit and the first and second qubits alters at least one energy levels of computational states of the system to thereby reduce an always-on ZZ interaction.