HUN-REN-BME-BCE Quantum Technology Research Group (QTRG)

Hosted by:
Department of Theoretical Physics
Institute of Physics
Faculty of Natural Sciences
Budapest University of Technology and Economics (BME)
Muegyetem rkp. 3, H-1111 Budapest, Hungary

Contact

Group leader: Andras Palyi
Office: BME "F" building, stairway III., ground floor, room 6.
Email: palyi dot andras at ttk dot bme dot hu

News

• 2025/09/27 - Researchers' Night outreach events with QTRG contributions: Gergo Pinter with his students' project exhibition and live performance of his science-inspired songs (here, here, and here), and Andras Palyi with a talk on quantum computers.
• 2025/09/26 - Great talks from James Wootton (Moth, Basel) and Andrea Morello (UNSW, Sydney) at our department. See abstracts here and here.
• 2025/09/26 - Around 300 colleagues gathered, presented, discussed at the QTech-Budapest conference on quantum science and technology, which we helped to organize. Thanks to all who contributed! QTRG talks from Baksa Kolok, Domonkos Svastits, and posters from Anirban Das, Sudipto Das, Abel Kincses, Aritra Sen, Solomon Samuel, and Daniel Varjas.
• 2025/09/24 - Congratulations to QTRG member Anirban Das for winning the 3rd Prize of the SpinQubits poster session at the QTech-Budapest conference!
• 2025/09/12 - Seminar talk of Miklos Werner (Wigner RCP Budapest) at our department on Real-Time Dynamics in a (2+1)-D Gauge Theory: The Stringy Nature on a Superconducting Quantum Simulator.
• 2025/08/24 - Four QTRG talks at the meeting of the Roland Eotvos Physical Society in Pecs, delivered by group members Janos Asboth, Istvan Csepanyi, Andras Palyi, and Domonkos Svastits. Program booklet available here as a pdf.
• 2025/07/24 - New QTRG manuscript on arXiv: Multifold degeneracy points of quantum systems and singularities of matrix varieties.
• 2025/06/20 - Student Workshop on Integrability at Eotvos University in Budapest, featuring QTRG contributions: a talk by Miklos Toth, on "Sine-Gordon model at finite temperature: the method of random surfaces", and a poster by Istvan Csepanyi, on "Finite-Temperature Correlation Functions and Nonanalytic Behavior in the Ising Field Theory".
• 2025/06/17 - Seminar talk of Sun Woo Kim (King's College) at our department on Circuits as a simple platform for hydrodynamics.
• 2025/06/12 - Annual workshop of the Quantum Information National Laboratory of Hungary, featuring QTRG posters from Janos Asboth, Baksa Kolok, Gergo Pinter, and Domonkos Svastits.
• 2025/05/27 - Seminar talk of Andras Palyi at RWTH Aachen, upon invitation of Szabolcs Csonka, Christoph Stampfer, and Fabian Hassler, on "Spin qubits in semiconductors with strong spin-orbit coupling".
• 2025/05/23 - Quantum Matter 2025 conference in Grenoble, with three QTRG talks, presented by Sudipto Das, Andras Palyi, and Domonkos Svastits.
• 2025/05/23 - Talk of Aron Marton (Aachen) at our department seminar, on Lattice surgery-based logical state teleportation via noisy links.
• 2025/05/23 - New QTRG manuscript on arXiv, in collaboration with Faulhorn Labs: Multi-shot readout error benchmark of the nitrogen-vacancy center's electronic qubit.
• 2025/05/23 - New QTRG manuscript on arXiv, in collaboration with IBM, ELTE, Moth, Uni Basel, and TU Delft: Readout sweet spots for spin qubits with strong spin-orbit interaction.
• 2025/03/21 - Talk of Tibor Rakovszky at our department seminar, on Topological Quantum Spin Glass Order and its realization in qLDPC codes.
• 2025/05/09 - Balint Domokos gave a talk on his work on Characterization of errors in a CNOT between surface code patches at our department seminar.
• 2025/05/08 - The half-a-day workshop NV Cafe brought together Budapest researchers working on point-defect-based quantum technologies. Sponsored and hosted by Faulhorn Labs, organized by Faulhorn's Peter Boross and Gyozo Egri, ELTE's Viktor Ivady, and QTRG group leader Andras Palyi.
• 2025/05/06 - Short talk by Andras Palyi on "What do we need for quantum advantage", at BME's jovotervezo.bme outreach lecture series.
• 2025/04/28 - New QTRG manuscript on arXiv: Acoustic phonons, spin-phonon coupling and spin relaxation via the lattice reorientation mechanism in hexagonal germanium nanowires.
• 2025/04/25 - Budapest Integrability Day at the Wigner Research Centre for Physics, featuring a QTRG talk on the Sine-Gordon model at finite temperature: a method of random surfaces, presented by Miklos Toth.
• 2025/04/14 - Great crowd and insightful talks at the World Quantum Day Meetup in Budapest, kindly hosted and sponsored this year by IBM Hungary.
• 2025/04/09 - New QTRG manuscript on arXiv, in collaboration with ELTE's Zoltan Gyorgy and Gabor Szechenyi: Limitations of the g-tensor formalism of semiconductor spin qubits.
• 2025/04/07 - New QTRG paper, with Miklos Toth as first author and Marton Kormos as last author, is published in Physical Review B as an Editors' Suggestion: Sine-Gordon model at finite temperature: The method of random surfaces.
• 2025/03/31 - Two-day ONCHIPS work package meeting at TU Munich in Garching, with participation of Anirban Das, Baksa Kolok, Daniel Varjas, and Andras Palyi.
• 2025/03/28 - Talk of Gergo Pinter on Multifold degeneracy points of quantum systems and singularities of matrix varieties, delivered in the HUN-REN Alfred Renyi Institute of Mathematics. Video recording here.
• 2025/03/28 - Talk of Curt von Keyserlingk (King's College London) at our department seminar, on particle lifetimes in 1D lattice fermion systems at finite temperature.
• 2025/03/21 - Talk of Anirban Das at our department seminar, on the Role of interface hybridization on induced superconductivity in 2D heterostructures.
• 2025/03/14 - Talk of Sudipto Das at our department seminar, on the Theory of the Novel Phase of Fractional Quantum Hall States in the Second Landau Level.
• 2025/03/13 - Quantum error correction talks from our group, on logical CNOT and on the optimization of the number of measurement rounds, at the DPG SAMOP Spring meeting in Bonn.
• 2025/03/10 - Talk of Robert Nemeth (ELTE) at our Quantum Computing Group Meeting, on "Omnidirectional shuttling to avoid valley excitations in Si/SiGe quantum wells".
• 2025/03/07 - Talk of Tibor Rakovszky at our department seminar, on "Entanglement, topological order and glassiness in finite temperature quantum phases".
• 2025/03/04 - Talk of Adolfo del Campo (Luxemburg) at the Szilard Leo Colloquium, on "Phase transition dynamics: from cosmology to quantum computing".
• 2025/02/28 - Talk of Janos Asboth at our department seminar, on "Topological fine structure of an energy band ".
• 2025/02/21 - Talk of Frederic Holweck (Belfort-Montbeliard) at our department seminar, on "Contextuality and quantum computing".
• 2025/02/17 - Upon invitation of Peter Levay, Frederic Holweck delivers a lecture series at the BME Institute of Physics on Detecting Entanglement with a Quantum Computer.
• 2025/02/14 - Talk of Gergo Thiering (Wigner RCP) at our department seminar, on "Ab-initio theory of orbital and phonon driven relaxation pathways in quantum defects of semiconductors".
• 2025/01/29 - Postdoctoral research fellows Dr. Anirban Das, Dr. Solomon Samuel, and Dr. Sudipto Das joined the group.
• 2025/01/27 - Izabella Lovas (ETH Zurich) gave a talk at our weekly spin qubit group meeting, on "Quantum phases of matter under non-unitary dynamics", focusing mostly on this work.
• 2025/01/21 - Kick-off meeting of our newly established HUN-REN-BME-BCE Quantum Technology Research Group.
• 2025/01/20 - Tamas Krivachy (ICFO Barcelona) gave a talk at our weekly spin qubit group meeting, on "Topologically Robust Quantum Network Nonlocality".
• 2025/01/09 - Online kick-off meeting of QLSI2. With QTRG's contribution, this Horizon Europe project aims to build quantum computer prototypes based on silicon-based spin qubits.

Group members

Affiliated members:

• Dr. Janos Asboth (senior research fellow)
• Bence Fitos (junior research fellow)
• Baksa Kolok (junior research fellow)
• Dr. Marton Kormos (senior research fellow)
• Anna Krasznai (junior research fellow)
• Dr. Peter Levay (senior research fellow)
• Dr. Andras Palyi (group leader)
• Dr. Gergo Pinter (research fellow)
• Prof. Miklos Pinter (senior research fellow)

Associated members:

• Istvan Csepanyi
• Dr. Anirban Das
• Dr. Sudipto Das
• Prof. Balazs Dora
• Dr. Balazs Hetenyi
• Dr. Tibor Rakovszky
• Aritra Sen
• Dr. Solomon Brhanu Samuel
• Domonkos Svastits
• Miklos Toth
• Dr. Angelo Valli
• Dr. Daniel Varjas

Undergraduate students:

• Csongor Hunyady
• Abel Kincses
• Marcell Nemeth

Publications

With QTRG affiliation:

1. Gy. Frank, A. Palyi, G. Pinter, D. Varjas
   Multifold degeneracy points of quantum systems and singularities of matrix varieties
   [arXiv]
2. P. Boross, D. Svastits, Gy. Egri, A. Palyi
   Multi-shot readout error benchmark of the nitrogen-vacancy center's electronic qubit
   J. Appl. Phys. 137, 214401 (2025), [arXiv]
3. D. Svastits, B. Hetenyi, G. Szechenyi, J. Wootton, D. Loss, S. Bosco, A. Palyi
   Readout sweet spots for spin qubits with strong spin-orbit interaction
   [arXiv]
4. B. Kolok, Gy. Frank, A. Palyi
   Acoustic phonons, spin-phonon coupling and spin relaxation via the lattice reorientation mechanism in hexagonal germanium nanowires
   [arXiv]
5. Z. Gyorgy, A. Palyi, G. Szechenyi
   Limitations of the g-tensor formalism of semiconductor spin qubits
   Phys. Rev. B 112, 045428 (2025) [arXiv]
6. M. Toth, J. H. Pixley, D. Szasz-Schagrin, G. Takacs, and M. Kormos
   Sine-Gordon model at finite temperature: The method of random surfaces
   Phys. Rev. B 111, 155112 (2025) -- Editors' Suggestion, [arXiv]
7. A. Marton, J. Asboth
   Optimal number of stabilizer measurement rounds in an idling surface code patch
   Quantum 9, 1767 (2025)

With QTRG acknowledgment:

1. Benedikt Placke, Grace M. Sommers, Nikolas P. Breuckmann, Tibor Rakovszky, Vedika Khemani
   Expansion creates spin-glass order in finite-connectivity models: a rigorous and intuitive approach from the theory of LDPC codes
   [arXiv]
2. Peter Levay, Csaba Velich
   A thermofield-double model of Uhlmann anholonomy
   [arXiv]
3. Bercel Boldis, Peter Levay
   A holographic connection between strings and causal diamonds
   [arXiv]
4. Adam Bacsi, Doru Sticlet, Catalin Pascu Moca, Balazs Dora
   Infinite temperature spin dynamics in the asymmetric Hatsugai-Kohmoto model
   [arXiv]
5. Shu-Tong Zhou, Meng Cheng, Tibor Rakovszky, Curt von Keyserlingk, Tyler D. Ellison
   Finite-temperature quantum topological order in three dimensions
   [arXiv]

Research funding, 2025 Spring

Our group is funded by the HUN-REN Hungarian Research Network. We also acknowledge funding from the following grants:

• QNL, Quantum Information National Laboratory of Hungary, NKFIH Hungary
• IGNITE, Integrated Germanium Quantum Technology, Horizon Europe
• ONCHIPS, On-Chip Integration of Quantum Electronics and Photonics, Horizon Europe
• OpenSuperQPlus, Open Superconducting Quantum Computers, Horizon Europe
• QLSI2, Initiative for a European Semiconductor-based Large-scale Quantum Computer, Horizon Europe
• Correlations in non-equilibrium quantum field theories and lattice models, OTKA K, 2021-2025

For group members

Funding acknowledgment (updated: 2025/02/28): This work was supported by the HUN-REN Hungarian Research Network through the Supported Research Groups Programme, HUN-REN-BME-BCE Quantum Technology Research Group (TKCS-2024/34).

Affiliation (updated: 2025/04/23) HUN-REN-BME-BCE Quantum Technology Research Group, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary

Regular events:

1. Quantum Computing Group Meeting, Mondays 14:15-15:30, library.
2. Szilard Colloquium, Tuesdays 14:30-15:30, lecture hall F 13.
3. Quantum World 2 Reading Seminar, Thursdays 8:30-10:00, seminar room of the FA building.
4. Quantum Many-Body Systems Seminar, Thursday 12-14.
5. Seminar of the Department of Theoretical Physics, Fridays 10:15-11:15, seminar room of the theory department.