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

• 2025/03/28 - 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.
• 2025/04/28 - 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".
• 2025/02/14 - 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)
• Istvan Csepanyi (junior research fellow)
• Baksa Kolok (junior research fellow)
• Dr. Marton Kormos (senior research fellow)
• Dr. Andras Palyi (group leader)
• Dr. Gergo Pinter (research fellow)
• Prof. Miklos Pinter (senior research fellow)

Associated members:

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

Undergraduate students:

• Abel Kincses
• Marcell Nemeth

Publications

With QTRG affiliation:

1. 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]
2. 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]
3. B. Kolok, Gy. Frank, A. Palyi
   Acoustic phonons, spin-phonon coupling and spin relaxation via the lattice reorientation mechanism in hexagonal germanium nanowires
   [arXiv]
4. Z. Gyorgy, A. Palyi, G. Szechenyi
   Limitations of the g-tensor formalism of semiconductor spin qubits
   [arXiv]
5. 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]
6. A. Marton, J. Asboth
   Optimal number of stabilizer measurement rounds in an idling surface code patch
   Quantum 9, 1767 (2025)

With QTRG acknowledgment:

1. Bercel Boldis, Peter Levay
   A holographic connection between strings and causal diamonds
   [arXiv]
2. Adam Bacsi, Doru Sticlet, Catalin Pascu Moca, Balazs Dora
   Infinite temperature spin dynamics in the asymmetric Hatsugai-Kohmoto model
   [arXiv]
3. 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.