Entanglement detection from conductance measurements in carbon nanotube Cooper pair splitters

Bernd Braunecker, Pablo Burset, Alfredo Levy Yeyati

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

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 the Bell 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 inequality is within the reach of current experimental setups.
Original languageEnglish
Article number136806
Number of pages5
JournalPhysical Review Letters
Volume111
Issue number13
DOIs
Publication statusPublished - 25 Sept 2013

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