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Rok Žitko, research councillor at the "Jožef Stefan" InstituteOffice: Teslova 30, 1st floor, room 30 F1 - Department of Theoretical Physics "Jožef Stefan" Institute Jamova 39 SI-1001 Ljubljana, Slovenia ORCID LinkedIn rok.zitko@ijs.si |
I study quantum many-body effects in superconducting devices and strongly correlated materials, with a focus on quantum impurities, subgap states, and electronic transport. My work combines analytical approaches with numerical renormalization group and dynamical mean-field theory, and includes the development of open-source research software.
Quasiparticle-resolved variational theory of Andreev spin qubits
Teodor Iličin, Rok Žitko
· Preprint:
arXiv:2610.08557
· PDF
A variational description of Andreev spin qubits in quantum-dot Josephson junctions, showing how virtual quasiparticles determine their Josephson couplings.
Numerical renormalization group solver for interacting quantum impurity models, including quantum dots and magnetic impurities in normal and superconducting hosts. It computes thermodynamic quantities, spectral functions, and transport coefficients, and can be used as an impurity solver in dynamical mean-field theory.
A Mathematica package for symbolic calculations with noncommuting operators in second quantization. It handles fermionic, bosonic, and spin algebras, including normal ordering, Wick contractions, symmetry-adapted bases, and operator matrix representations.
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Variational solution of the superconducting Anderson impurity model and the
band-edge singularity phenomena
Teodor Iličin, Rok Žitko SciPost Phys. 19, 006 (2025)  (PDF)
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Correlation between two distant
quasiparticles in separate superconducting
islands mediated by a single spin
Juan Carlos Estrada Saldaña, Alexandros Vekris, Luka Pavešić, Rok Žitko, Kasper Grove-Rasmussen, Jesper Nygård Nat. Commun. 15, 3465 (2024) (PDF)
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Direct manipulation of a superconducting spin qubit strongly coupled
to a transmon qubit
Marta Pita-Vidal, Arno Bargerbos, Rok Žitko, Lukas J. Splitthoff, Lukas Grünhaupt, Jaap J. Wesdorp, Yu Liu, Leo P. Kouwenhoven, Ramón Aguado, Bernard van Heck, Angela Kou, Christian Kraglund Andersen Nat. Phys. 19, 1110 (2023) (PDF)
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I welcome enquiries about student projects and collaborations in quantum many-body physics, superconducting devices, and strongly correlated systems. Students can browse the student seminar topics. Please email rok.zitko@ijs.si with a brief description of your interests and background.
