Project description
Silicon-based superconductor-semiconductor hybrid circuits
Cobalt disilicide (CoSi2) is a promising superconducting material compatible with silicon (Si) electronics, yielding a near-defect-free interface and very low resistance noise. With the support of the Marie Skłodowska-Curie Actions programme, the Si-SSHQ project aims to realise and characterise superconductor-semiconductor hybrid quantum circuits leveraging CoSi2/Si materials, overcoming longstanding challenges associated with other platforms. Si-SSHQ aims to enable sufficient Cooper pair tunnelling at the interface, realise scalable Josephson field effect transistors and integrate these with CoSi2 microwave cavities to prototype Si-based hybrid superconducting ‘gatemon’ qubits. In parallel, it will investigate triplet superconducting correlations in CoSi2 and a route towards a triplet-based minimal Kitaev chain – a potential pathway to topological quantum computing without the need for strong spin-orbit or non-uniform magnetic fields.
Objective
Recently, cobalt disilicide (CoSi2) has emerged as a promising Si-based superconducting material with an exceptional lattice match with Si, leading to a nearly defect-free CoSi2/Si interface and extremely low 1/f resistance noise. Furthermore, recent studies have reported signatures of triplet correlations in superconducting CoSi2.
In this proposal, I will realize various essential superconductor-semiconductor hybrid quantum circuits in the CoSi2/Si platform addressing longstanding challenges associated with the limited scalability of hybrid devices realized on other platforms. This will be mainly achieved by enhancing the Schottky barrier transparency at the CoSi2/Si interface, allowing sufficient Cooper pair tunneling to Si. This will enable realization of a scalable CoSi2/Si/CoSi2 Josephson field effect transistor (JoFET). Consequently, I will integrate the implemented JoFETs with the CoSi2 microwave cavity to realize a prototype for Si-based gatemon qubits.
In parallel, I will also investigate the triplet correlation in CoSi2 by engineering CoSi2/Si-based CPS with a nearly perfect efficiency and measuring the magnitude of the triplet current. If the triplet current is sufficiently large to equalize the elastic cotunneling (ECT) and crossed Andreev reflection (CAR) amplitudes, it will provide a pathway for realization, characterization, and scaling up a triplet-based minimal Kitaev chain (TMKC), avoiding engineering platforms with strong spin-orbit fields or non-uniform magnetic fields.
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.
- natural sciences chemical sciences inorganic chemistry transition metals
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering computer hardware quantum computers
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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)
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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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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-GF - HORIZON TMA MSCA Postdoctoral Fellowships - Global Fellowships
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(opens in new window) HORIZON-MSCA-2025-PF
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02150 Espoo
Finland
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