Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2002-05-31
Nanotechnology 14, 77 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 7 figures, updated version
Scientific paper
10.1088/0957-4484/14/1/318
We propose a device which implements a solid-state nanostructured electron entangler. It consists of a single-walled carbon nanotube connected at both end to normal state electrodes and coupled in its middle part to a superconducting nanowire. Such a device acts as an electronic beam splitter for correlated electrons originating from the superconductor. We first show that it can be used to detect positive (bosonic--like) noise correlations in an fermionic system. Furthermore, it provides a source for entangled electrons in the two arms of the splitter. For generating entangled electron states, we propose two kinds of setup based either on spin or energy filters. It respectively consists of ferromagnetic pads and of a system of electrostatic gates which define quantum dots. The fabrication of this device would require state-of-the-art nanofabrication techniques, carbon nanotube synthesis and integration, as well as atomic force microscopy imaging and manipulation.
Bouchiat Vincent
Chtchelkatchev N.
Feinberg Denis
Lesovik Gordey B.
Martin Tara
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