A problem in quantum computing called “quantum scrambling” hampers the technology’s development. Scrambling results in the loss of data in a quantum computing system, an issue previously thought to be irreversible. A UC Irvine team has discovered a way to reverse the scrambling process.

Raising the temperature for topological superconductivity is crucial for easing the search for Majorana fermions. One proposed route is to engineer twisted junctions from high-temperature cuprates. The recent observation of a key predicted feature—fractional ac Josephson effect—has prompted further endeavors toward topological quantum computations. However, a new study now challenges this interpretation, revealing the effect's metastable nature and demonstrating a non-topological protocol for manipulating the fractional effect.