Double-transmon coupler will realize faster, more accurate superconducting quantum computers

 https://phys.org/news/2022-09-double-transmon-coupler-faster-accurate-superconducting.html

"double transmon coupler comprises two fixed-frequency transmon qubits... double-transmon coupler has one loop...  three x's on loop represent two transmon Josephson junctions and additional Josephson junction...  magnetic flux in loop, Φex...tuned by external magnetic field to bring coupling strength between qubits on both sides to exactly zero, switching off coupling... coupling strength increased to several tens of megahertz by increasing magnetic flux... gate operations with  accuracy 99.99%"