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Sujet de stage / Master 2 Internship

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Manipulation of the quantum state of individual superconducting excitations in nanowires

Contact: GOFFMAN Marcelo, , marcelo.goffman@cea.fr, +33 1 69 08 55 29
Summary:
We propose to develop experiments aiming at the quantum manipulation of localized states that arise in semiconducting nanowires connecting superconducting electrodes.
Possibility of continuation in PhD: Oui
Deadline for application:27/04/2018

Full description:
Electrons in superconductors form Cooper pairs that cannot be probed individually because they are delocalized and overlapping. However, localized states appear at weak links between superconducting electrodes. Using atomic contacts as a weak link, we performed the spectroscopy of these localized states [1] and demonstrated the quantum manipulation of a localized Cooper pair [2].
During the internship, we plan to develop similar experiments with InAs semiconducting nanowires. Longer coherence times are expected, and, because of the strong spin-orbit coupling in InAs, one should also be able to manipulate the spin of localized electrons.

The student will be integrated in an active research group on quantum electronics and get acquainted with advanced concepts of quantum mechanics and superconductivity. He/she will also learn several experimental techniques: low temperatures, low-noise and microwave measurements, and nanofabrication.

[1] L. Bretheau et al., “Exciting Andreev pairs in a superconducting atomic contact”
Nature 499, 312 (2013). arXiv:1305.4091
[2] C. Janvier et al., “Coherent manipulation of Andreev states in superconducting atomic contacts”
Science 349, 1199 (2015), arXiv:1509.03961

Technics/methods used during the internship:
The subject requires the student to develop a good understanding of quantum physics, and to learn and master different techniques: nanofabrication, low temperatures, low-noise and microwave measurements. He/she will be integrated in an active research group on quantum electronics.

Laboratory
Tutor of the internship

 

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