Electronic Quantum Resources

• Applicant: Dr. Niels Ubbelohde
• Subject Area: Experimental Condensed Matter Physics ; Theoretical Condensed Matter Physics
• Term: since 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 532804799

ElQuRes aims to unlock and connect two novel types of electronic quantum resources: coherent (Fourier-limited) single-electron wave packets and quantum states of edge magnetoplasmon resonators (EMP) modes. Both these resources will break new grounds for electronic quantum technologies: while on-demand sources achieve high-fidelity for metrological standards of electrical current down to the regime of resolving single charges, accessing the coherent properties of the generated electron wave packets remains an open challenge; EMP resonators will utilize the established semiconductor heterostructure platform as a new direction in exploiting quantumness where the complementarity of bosonic and fermionic representation of the electrical current will be used to create and manipulate non-classical states of confined EMP modes. Experimentally the project aims to (1) demonstrate the feasibility of modular EMP resonators of sufficiently high-quality factors to enable the vision of quantum information storage and processing; and (2) demonstrate coherent emission of single-electron wave packets from a tunable quantum dot source with time resolution on the picosecond scale. The project will: (i) develop a unified framework for quantum tomography of electrical currents integrating different energy regimes and measurement principles; (ii) establish foundations for control of coherent light-matter coupling between single to few electrons and electromagnetic fields with the aim of generating non-classical states for microwave photons; (iii) demonstrate sources of coherent picosecond-scale wave-packets that enable all-electrical metrology of electrical signals with quantum resolution. The long-term vision of ElQuRes is to establish a new paradigm rooted in semiconductor electronics where quantum information is transferred and manipulated by microscopic electrical degrees of freedom.

• DFG Programme: Research Grants
• International Connection: France, Latvia
• Partner Organisation: Agence Nationale de la Recherche / The French National Research Agency
• Cooperation Partners: Professor Dr. Pascal Degiovanni; Professor Dr. Vyacheslavs Kashcheyevs; Dr. Gerbold Ménard