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Projects / Programmes source: ARIS

Carbon nanotube based spin qubits

Research activity

Code Science Field Subfield
1.02.00  Natural sciences and mathematics  Physics   

Code Science Field
P260  Natural sciences and mathematics  Condensed matter: electronic structure, electrical, magnetic and optical properties, supraconductors, magnetic resonance, relaxation, spectroscopy 
Keywords
Quantum information processing, nano-techology, new materials, carbon nanotubes, fullerenes.
Evaluation (rules)
source: COBISS
Researchers (6)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  22322  PhD Samir El Shawish  Energy engineering  Researcher  2011  151 
2.  18270  PhD Kristjan Haule  Physics  Researcher  2008 - 2010  69 
3.  25625  PhD Jernej Mravlje  Physics  Researcher  2009 - 2011  131 
4.  04544  PhD Anton Ramšak  Computer science and informatics  Head  2008 - 2011  199 
5.  19162  PhD Tomaž Rejec  Physics  Researcher  2008 - 2011  69 
6.  23567  PhD Rok Žitko  Physics  Researcher  2008 - 2009  253 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  91,005 
Abstract
We propose a research project devoted to modelling of quantum control of electron spins in new carbon nanomaterials. We will exploit quantum phenomena such as coherent superposition of quantum states, non-locality, and entanglement to create devices for tasks that would not be feasible using classical phenomena alone, but are essential ingredients for quantum information processing devices. Working alongside some of the theorists who have contributed to the development of these concepts, and together with other experimentalists (University of Oxford and QinetiQ, UK), the project will pursue a program of modelling the electrical detection of quantum entanglement and the transfer of quantum information along spin-chains and between one form and another on devices whose primary construction elements are carbon nanotubes and fullerenes.
Significance for science
The project has contributed in an important way to the understanding of the magnetic properties of the smallest nanostructures for the storage and processing of quantum information. We have namely explored the interplay of the magnetic anisotropy effects and the coupling of the magnetic moment with the conduction-band electrons. Formerly, the majority of theoretical models were derives assuming isotropy in the spin space, in spite of the fact that in systems with strongly reduced symmetry (which is the case for single magnetic atoms on surfaces of conducting materials and in the interior of nanostructures) the magnetic anisotropy effects are very large. The results of our calculations are in good agreement with recent measurements of magnetic properties of single atoms using tunneling microscopes, perfomed in the facilities of IBM Research, Almaden, USA. Better understanding of the magnetic anisotropty in single atoms sheds new light on the magnetism of nanostructures, which is of major importance for continued miniaturization of electronic devices; if the magnetic anisotropy would be increased for another order of magnitude, for example by exchange coupling between strongly anisotropic atoms, it would be conceivable to perform experiments at temperatures approaching the root temperature (today the experiments are performed in cryogenic environment).
Significance for the country
The results of the project are significant for the perception of Slovenia in the international community, as they have established Slovenia's position among the countries with well developed methods and procedures for studying some of the most demanding problems in the field of spin physics in nanostructures.
Most important scientific results Annual report 2008, 2009, final report, complete report on dLib.si
Most important socioeconomically and culturally relevant results Annual report 2008, 2009, final report, complete report on dLib.si
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