Many quantum technologies rely on separating and interrogating entangled particles. Superconductors already come with a supply of paired-up entangled electrons—the Cooper pairs that give these materials their transport properties. However, extracting and separating them on demand is a challenge. Now theorist Christian Flindt of Aalto University in Finland and his collaborators have shown that the splitting of Cooper pairs can be accurately controlled using time-dependent voltages [1].
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