Superconducting qubits in Russia

Results of the two-year research in the framework of the first Russian project for superconducting qubits, supported by the Foundation for Advanced Research, Federal Agency on Atomic Energy, and the Ministry of Science and Higher Education of the Russian Federation, are presented. The main result is the demonstration of single-qubit quantum gate operations using several types of superconducting qubits with a coherence time of more than 1 μs. The project develops this breakthrough scientific and technical line of research in Russia, in fact, from scratch. The fabrication technology of submicron-scale superconducting tunnel junctions and various coherent quantum structures (qubits) based on them has been worked out; preparation and control of quantum states for such qubits, quantum tomography of prepared states, and realisation and precision control of single-qubit quantum gate operations are demonstrated.