New Russian method developed for fast three-qubit operation on fluxoniums

Scientists from the NUST MISIS and the Russian Quantum Center have developed a new approach to performing a three-qubit operation on superconducting qubits — fluxoniums. This project has already been supported by Rosatom as part of the Roadmap for Quantum Computing.

As explained in the press service of NUST MISIS, the implementation of a multi-qubit entangled state is one of the most important tasks for quantum computing. Entanglement allows extracting useful information from the calculation of a function at several points, which is allowed by superposition.

Most modern quantum processors use two-qubit quantum operations, but errors occur during their implementation. Three-qubit operations can perform a larger range of algorithms in fewer steps, and they have fewer errors.

They are performed on a new type of superconducting qubits — fluxoniums. Fluxoniums significantly outperform the most common qubits — transmons — in terms of isolation of computational states, coherence time, and other significant indicators. The connecting element is a transmon qubit, but more resistant to technological errors.

Quantum processors with a three-qubit operation can potentially be used to create a "noisy" quantum processor and algorithms for effective multi-qubit operations. Quantum effects are useful for studying molecules, creating medicines, effectively solving logistics problems, and searching in a database.

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