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M/F: PhD Student - Ab initio Control of Defects for Quantum Bits: Screening, Quantifying, Qualifying and Selecting

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : mardi 18 mai 2021

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General information

Reference : UPR8001-ANNHEM-006
Workplace : TOULOUSE
Date of publication : Tuesday, April 27, 2021
Scientific Responsible name : Anne HEMERYCK
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 2 November 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

CMOS qubit technologies is one of the most promising paths towards the development of efficient and low-cost quantum materials. Indeed silicon-(silicon derivatives)-based qubits could allow the use of already existing high-performance manufacturing processes and controlled thermal budgets. In addition, silicon operates at a higher temperature than present superconductor-based qubits such offering much better possibilities for the integration into electronic devices. The development of this innovative technology is progressing very quickly. However, as the development is based on testing steps known as “trial and errors” the associated technological costs are still high and its optimisation in terms of characterisation, discovery and design of new silicon-based qubits is still at its infancy.
This thesis topic proposes to help the technological development of CMOS qubit in particular by a modelling approach allowing to screen, quantify, qualify and select potential defects in silicon and other semi-conductors to be used as qubits.

We propose to develop a simple and generic transverse model allowing the prediction of defect characteristics, based on molecular orbitals and defect symmetry. Then, in a second step, we draw up an exhaustive catalog of defects that may present properties of interest for such applications using elaborate modelling techniques, at ab initio level and beyond. The final objective of this work will be to generate an exhaustive database of defects and defect properties that could be of interest for industry. In addition, dedicated experiments will be conducted in the framework of this thesis to validate and compare the predictions from the models.

Work Context

This thesis will be partially financed by the Institut Quantique Occitan, created in the framework of the Défi Clés of the Occitanie Region, France.
This 3-year thesis will be carried out under the co-direction of the LAAS-CNRS of Toulouse in France (Dr Anne Hemeryck) and the CNR-IOM of Trieste in Italy (Dr Layla Martin Samos) and co-supervises by the CEA-DAM-DIF in Arpajon, France (Dr Nicolas Richard). This PhD thesis will be attached to the University of Toulouse III-Paul Sabatier. The doctoral student will therefore carry out his/her thesis in Trieste and in Toulouse. To carry out his/her work, the student will be able to take advantage of the supercomputers to which both the LAAS-CNRS and the CNR-IOM have access and will interact with researchers in materials science and microelectronics engineers. The work will be carried out in the framework of an active collaboration with SISSA in Trieste, Italy (Dr Gabriela Herrero Saboya, Prof Stefano De Gironcoli) and UNG, Slovenia (Dr Luigi Giacomazzi) in which the student will be strongly involved.

We are looking for a skilled and motivated candidate who is qualified with solid state physics, theoretical physics and linux. An experience in ab initio calculations and computer programming would be a plus.

Constraints and risks

none

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