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Researchers at Russian institutions have demonstrated in three-terminal nanowire devices that distinguishing crossed Andreev reflection from elastic co-tunneling requires moving beyond standard linear response measurements. By analyzing the full differential conductance matrix, they revealed that voltage symmetry arises from a self-gating effect rather than straightforward control of these competing quantum processes. This finding clarifies fundamental limitations in interpreting transport data for topological superconductivity and non-local entanglement protocols.

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Superconductor junctions blur the line between two quantum effects

Quantum ZeitgeistAugust 12, 20264 min read

Transport measurements in three-terminal normal–superconductor–normal devices reveal it’s difficult to distinguish crossed Andreev reflection from elastic co-tunneling.

Researchers have measured the full differential conductance matrix, defined as Gij = ∂ Ii/∂ Vj, moving beyond standard linear response measurements in three-terminal normal-superconductor-normal devices. These devices are based on topological insulator nanowires, and the work reveals how crossed Andreev reflection and elastic co-tunneling, two competing quantum processes, respond to applied voltages. Specifically, the team observed that crossed Andreev reflection is enhanced when V1 = V2, while elastic co-tunneling is enhanced when V1 = -V2, offering a potential pathway to control these subtle quantum effects. Researchers at…

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