Many quantum technologies rely on devices known as Josephson junctions, which allow an electric current to flow without resistance across a barrier separating two superconductors. The magnitude and direction of that current depend on the phase difference between the superconductors’ wave functions. Now Saulius Vaitiekėnas at the University of Copenhagen, Denmark, and his colleagues have demonstrated a way to tailor this current–phase relation [1]. Such tunability could allow scientists to develop new types of signal amplifiers, quantum simulators, and superconducting quantum bits.
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