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• Physics 16, s124
An indication that sure electron-transport processes could be tuned in a hybrid semiconductor-superconductor system might be helpful for growing quantum computer systems.
The hypothesized Majorana sure state is a quasiparticle that scientists assume might be a constructing block of a future quantum laptop. It’s predicted to be hosted by two quantum dots—semiconducting nanocrystals—separated by a slim superconducting section, however this could occur provided that the processes coupling the dots are completely balanced. Now Tom Dvir on the Delft College of Know-how within the Netherlands and his colleagues experimentally steadiness these processes in a hybrid semiconductor-superconductor system [1]. The experiments present no indicators of a Majorana sure state, however the researchers plan to make use of their findings to develop a way to identify this elusive quasiparticle.
The 2 processes that should be balanced are referred to as elastic cotunneling and crossed Andreev reflection. Elastic cotunneling is the motion of single electrons between the 2 quantum dots by means of the intervening superconducting section. Crossed Andreev reflection describes results associated to the formation of sure states between electrons that enter the intervening section from every dot.
In Dvir and colleagues’ system, a semiconducting nanowire hosts the quantum dots, and the intervening section takes the type of a skinny superconducting layer above the nanowire’s heart. The researchers discover that they’ll change the chances of elastic cotunneling and crossed Andreev reflection by various both the voltage utilized to an electrode beneath the system or the orientation of an exterior magnetic discipline. By rigorously tuning these parameters they efficiently steadiness the 2 processes. Evaluating their knowledge with a theoretical mannequin, they conclude that this controllability comes from a beforehand unseen sort of electron interference.
–Ryan Wilkinson
Ryan Wilkinson is a Corresponding Editor for Physics Journal based mostly in Durham, UK.
References
- A. Bordin et al., “Tunable crossed Andreev reflection and elastic cotunneling in hybrid nanowires,” Phys. Rev. X 13, 031031 (2023).
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