Phys.org  April 24, 2023 An international team of researchers (Israel, Germany, UAE) is improving the performance of superconducting qubits, the basic computation units of a superconducting quantum processor. They studied a series of tunable flux qubits inductively coupled to a coplanar waveguide resonator fabricated on a sapphire substrate. Each qubit included an asymmetric superconducting quantum interference device, which is controlled by the application of an external magnetic field and acts as a tunable Josephson junction. The tunability of the qubits is typically ±3.5GHz around their central gap frequency. The measured relaxation times are limited by dielectric losses in the substrate […]