"Revised Fundamental Equation for Superconducting Quantum Bits"

Physicists have discovered that Josephson tunnel junctions, the building blocks of superconducting quantum computers, are more complex than previously thought, with harmonics superimposed on the fundamental mode. This discovery could lead to quantum bits that are two to seven times more stable, potentially reducing errors and bringing us closer to the dream of a fully universal superconducting quantum computer. The researchers support their findings with experimental evidence from multiple laboratories across the globe and propose an extended model including higher harmonics to describe the tunneling current between the two superconductors.