SYSTEM AND METHOD FOR CONTROL OF INTERACTION BETWEEN SUPERCONDUCTOR QUBITS BASED ON HIGH KINETICAL INDUCTANCE Russian patent published in 2023 - IPC G06N10/40 

FIELD: quantum computing.

SUBSTANCE: invention relates to a system for controlling the interaction between superconducting qubits based on a high kinetic inductance. The system comprises two computational qubits and a tuneable bonding qubit that activates the interaction between two computational qubits, and which is galvanically coupled to two computational qubits, whereas the system comprises two two-electrode systems based on kinetic inductance and one bonding single-electrode system based on kinetic inductance, each two-electrode system has a linear non-frequency tuneable mode and a non-linear frequency tuneable mode, whereas the single-electrode system has only a non-linear frequency tuneable mode, and the linear modes of the first and second two-electrode systems based on the kinetic inductance have a Hamiltonian equivalent to the Hamiltonian harmonic oscillator, and the nonlinear modes of the first, second two-electrode systems and the coupling single-electrode system based on kinetic inductance have a Hamiltonian equivalent to the Hamiltonian of the fluxonium qubit, whereas the role of the first computational qubit is played by the nonlinear mode of the first two-electrode system based on kinetic inductance, the role of the second computational qubit is played by nonlinear mode of the second two-electrode system based on kinetic inductance, the role of a tuneable bonding qubit is played by a nonlinear mode of the bonding single-electrode system based on kinetic inductance, located between the first and second two-electrode systems based on kinetic inductance, and the kinetic inductances of the bonding single-electrode system based on kinetic inductance are galvanically coupled to one of the kinetic inductances of the first and second two-electrode systems based on the kinetic inductance, so that the galvanic connections with the first and second two-electrode systems based on the kinetic inductance are symmetrical.

EFFECT: controlling the interaction between superconducting qubits based on high kinetic inductance, having a fundamental transition frequency below 1 GHz, without the need to use a heterodyne circuit to generate microwave pulse signals exciting the qubits.

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