Nanowerk November 15, 2022
Superconducting qubits seem promising for useful quantum computers, but the currently wide-spread qubit designs and techniques do not yet provide high enough performance.
Researchers in Finland have developed a superconducting-qubit type, the unimon, which combines the desired properties of increased anharmonicity, full insensitivity to dc charge noise, reduced sensitivity to flux noise, and a simple structure consisting only of a single Josephson junction in a resonator. In agreement with their quantum models, they measured the qubit frequency and increased anharmonicity at the optimal operation point. It yielded, 99.9% and 99.8% fidelity for 13 ns single-qubit gates on two qubits with. The energy relaxation seemed to be dominated by dielectric losses. According to the researchers improvements of the design, materials, and gate time may promote the unimon to break the 99.99% fidelity target for efficient quantum error correction and possible useful quantum advantage with noisy systems…read more. Open Access TECHNICAL ARTICLEÂ
