AI Article Synopsis
- Spin-orbit interaction enables a spin filtering effect in carbon nanotube Cooper pair splitters, allowing for direct measurement of spin correlators through current.
- Bending the nanotube alters the filtering axes, creating conditions suitable for testing the entanglement of Cooper pairs using a Bell-like inequality.
- This method is experimentally viable, as it does not necessitate noise measurements or complete understanding of the spin-orbit interaction, while accommodating imperfect conditions.
Article Abstract
Spin-orbit interaction provides a spin filtering effect in carbon nanotube based Cooper pair splitters that allows us to determine spin correlators directly from current measurements. The spin filtering axes are tunable by a global external magnetic field. By a bending of the nanotube, the filtering axes on both sides of the Cooper pair splitter become sufficiently different that a test of entanglement of the injected Cooper pairs through a Bell-like inequality can be implemented. This implementation does not require noise measurements, supports imperfect splitting efficiency and disorder, and does not demand a full knowledge of the spin-orbit strength. Using a microscopic calculation we demonstrate that entanglement detection by violation of the Bell-like inequality is within the reach of current experimental setups.
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| http://dx.doi.org/10.1103/PhysRevLett.111.136806 | DOI Listing |
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