Project description
Germanium-based superconductive devices for quantum computation
One of the greatest challenges in quantum computing is engineering scalable quantum devices. Proximity-induced superconductivity is crucial in many quantum technologies, but commonly used III-V semiconductors are unsuitable for spin-based qubits due to their large hyperfine interaction. Germanium, however, presents a promising alternative – it supports proximity-induced superconductivity, has strong spin-orbit coupling, and can be nearly nuclear-spin free. Supported by the Marie Skłodowska-Curie Actions programme, the GeSuperQuant project aims to uncover the mechanisms behind superconducting proximity effects in germanium. By developing advanced theoretical models, the project will predict key properties, such as spin-orbit coupling and g-factors, in superconducting quantum devices. This research could pave the way for a new type of qubit, unlocking fresh possibilities for quantum computing.
Objective
A great scientific and technical challenges of our time is to engineer a scalable quantum computer, and proximity-induced superconductivity is one of the most important ingredients in many quantum devices. Proximitized III-V semiconductors can host a hard superconducting gap and have been vastly studied in super-semi quantum devices. Nevertheless, these material compounds are not suitable for spin-based qubits due to their large hyperfine interaction and are hence not ideal for use in hybrid devices. One of the most promising, but so far unexplored researched materials to use in such hybrid quantum devices is germanium: it is a potentially ideal host for proximity-induced superconductivity, and exhibits a hard superconducting gap, but can also be used for spin-based qubits since it has suppressed hyperfine interaction and can be isotope purified to be nearly nuclear-spin free. Additionally, it has an exceptionally large hole mobility, strong intrinsic spin-orbit coupling, as well as tunable g-factors, making it an ideal material to use in quantum devices. However, the mechanism for the superconducting proximity effect in germanium is still unknown.
In this project I will develop band models based on atomistic orbitals (kp theory), and combine them with T-matrix methods from Greens function theory, to show what mechanisms are responsible for proximity induced superconductivity in the hole bands of germanium. I will apply the results to g-factor dependent Andreev spin qubits and phase- and gate-tunable long-range spin-qubit couplers. I will predict effective spin-orbit coupling and g-factors in these superconducting quantum devices, using effective low-energy models (discretized on a lattice) to predict outcomes of future experiments on germanium-based quantum information devices. This will open up a new avenue of research, through the development of a new type of qubit.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering computer hardware quantum computers
- natural sciences physical sciences electromagnetism and electronics semiconductivity
- natural sciences chemical sciences inorganic chemistry metalloids
- natural sciences physical sciences electromagnetism and electronics superconductivity
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships
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Call for proposal
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
(opens in new window) HORIZON-MSCA-2024-PF-01
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Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.
1165 KOBENHAVN
Denmark
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.