Andras Palyi

associate professor
Department of Theoretical Physics
HUN-REN-BME-BCE Quantum Technology Research Group
Institute of Physics
Budapest University of Technology and Economics (BME)
Budafoki u. 8, H-1111 Budapest, Hungary

Contact

Office: "F" building, stairway III., ground floor, room 6.
Email: palyi dot andras at ttk dot bme dot hu
Phone: +36 1 463 4109

News

• 2025/01/29 - Postdoctoral research fellows Dr. Anirban Das 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. This Horizon Europe project aims to build quantum computer prototypes based on silicon-based spin qubits.
• 2024/12/12 - Our "birth quota" paper has just been published in Physical Review B, although under a modified title: "Upper bound on the number of Weyl points born from a nongeneric degeneracy point".
• 2024/12/11 - Our proposal to launch the HUN-REN--BME Quantum Technology Research Group has been funded. The 3-year project will start on January 1st, 2025.
• 2024/12/10 - New manuscript from our group on arXiv: "Compiling the surface code to crossbar spin qubit architectures".
• 2024/11/12 - Upon our invitation, Alioscia Hamma from Naples gave a talk at our local physics colloquium, the Leo Szilard Colloquium, on "Quantum complexity and scrambling entropy".
• 2024/11/08 - Gergo Pinter and Daniel Varjas gave a talk at our local seminar of the Department of Theoretical Physics, about our work on "Stability of Weyl Node Merging Processes under Symmetry Constraints".
• 2024/11/06 - Joint work with our Dresden and Amsterdam collaborators "Stability of Weyl Node Merging Processes under Symmetry Constraints" published in Physical Review Letters.
• 2024/10/18 - I gave a talk at the 10th Physics Meets Philosophy workshop about our unpublished work "Qubit measures qubit: A minimal model for qubit readout".
• 2024/09/24 - I gave a talk at our local physics colloquium, the Leo Szilard Colloquium, on "Quantum computing with single-electron quantum bits". Slides available here.
• 2024/09/04 - Aritra Sen gave a talk at the Silicon Quantum Electronics Workshop in Davos, Switzerland. Poster presentations from Baksa Kolok, David Pataki, Domi Svastits.
• 2024/07/22 - Gergo Pinter gave a contributed talk on "Equivariant contact equivalence applied in condensed matter physics", in Valencia, Spain, at the 18th International Workshop on Real and Complex Singularities.
• 2024/07/15 - New manuscript from our group on arXiv: "The geometry of the Hermitian matrix space and the Schrieffer--Wolff transformation".
• 2024/07/05 - Announcement of open postdoctoral positions in our research group.

Students and postdocs (2025 Spring)

• Dr. Gergo Pinter (postdoc)
• Dr. Anirban Das (postdoc, co-supervised by Daniel Varjas)
• Dr. Sudipto Das (postdoc)
• Akos Budai (PhD candidate, co-supervised with Zoltan Zimboras)
• Gyorgy Frank (PhD candidate)
• Baksa Kolok (PhD student)
• David Pataki (PhD candidate)
• Aritra Sen (PhD student)
• Domonkos Svastits (PhD student)

Former students and postdocs:

• Daniel Budanyi (BSc 2015)
• Dr. Peter Boross (PhD 2019, postdoc 2019-2022, currently at Faulhorn Labs, Budapest)
• Dr. Gabor Csiszar (postdoc, 2012-2014, then postdoc in Stuttgart)
• Dr. Matthias Droth (postdoc, 2016-2018, DFG fellow)
• Dr. Vahid Derakhshan Maman (postdoc 2018-2020, then postdoc in Utrecht)
• Gabriella Gorjanacz (MSc 2019)
• Zoltan Guba (BSc 2021, MSc 2023, currently PhD student at the University of Zurich)
• Dr. Bence Hetenyi (MSc 2018, then PhD student in Basel, currently postdoc at IBM Rueschlikon)
• Zoltan Koradi (BSc 2013, MSc 2015)
• Dr. Judit Romhanyi (postdoc, 2012/09-2012/12, then postdoc in Stuttgart, Okinawa, currently assistant professor at UC Irvine)
• Aron Rozgonyi (BSc, 2017, MSc, 2020, currently PhD student at Eotvos University)
• Dr. Gabor Szechenyi (PhD 2017, currently assistant professor at Eotvos University)
• Peter Trocsanyi (MSc 2024)
• Reka Tuza (BSc 2015, MSc 2017)
• Mate Tibor Veszeli (BSc 2015, MSc 2017, then PhD student at Eotvos University)

Research

We do research in condensed-matter theory and quantum information. As of Spring 2025, we focus on the physics of semiconductor spin qubits and superconducting qubits, quantum error correction, and topological properties of quantum systems. We often get inspired by experiments, and often collaborate with experimental research groups.

Research collaborators, 2025 Spring

• Natalia Ares (Oxford)
• Janos Asboth (BME Budapest)
• Stefano Bosco (TU Delft)
• Guido Burkard (Konstanz)
• Bence Hetenyi (IBM Research Zurich)
• Daniel Loss (Basel)
• Gabor Szechenyi (ELTE Budapest)
• Daniel Varjas (IFW Dresden / BME)
• Zoltan Zimboras (Wigner Research Centre for Physics)

Research funding, 2025 Spring

• 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, Horizon Europe
• HUN-REN-BME-BCE Quantum Technology Research Group

Teaching

2025, Spring semester

• Quantum Information Processing, lecture for physics BSc, MSc and PhD students at BME
• MSc Seminar, supervision for physics MSc students at BME

2024, Fall semester

• Modern Physics for Mechanical Engineers, lecture for mechanical engineering MSc students at BME
• Quantum Computing Architectures, lecture for physics MSc and PhD students at BME (with Gergo Fulop and Peter Makk)
• MSc Seminar, supervision for physics MSc students at BME

2024, Spring semester

• MSc Seminar, supervision for physics MSc students at BME

2023, Fall semester

• Modern Physics for Mechanical Engineers, lecture for mechanical engineering MSc students at BME
• Topological insulators, lecture for physics MSc and PhD students at BME and ELTE (with Janos Asboth and Laszlo Oroszlany)
• MSc Seminar, supervision for physics MSc students at BME

2023, Spring semester

• Quantum Information Processing, lecture for physics BSc, MSc and PhD students at BME (with Zoltan Zimboras)
• Theoretical Nanophysics, lecture for physics MSc and PhD students at BME (with Gergely Zarand)
• MSc Seminar, supervision for physics MSc students at BME

2022, Fall semester

• Modern Physics for Mechanical Engineers, lecture for mechanical engineering MSc students at BME
• Quantum Computing Architectures, lecture for physics MSc and PhD students at BME (with Gergo Fulop and Peter Makk)
• MSc Seminar, supervision for physics MSc students at BME

Brief CV

2015/09 -	associate professor, Budapest University of Technology and Economics, Hungary
2011/04 - 2015/08	part-time research fellow, Budapest University of Technology and Economics, Hungary
2011/01 - 2015/08	assistant professor, Eotvos University, Budapest, Hungary
2008/11 - 2010/12	postdoctoral researcher, University of Konstanz, Germany (supervisor: G. Burkard)
2008	PhD, Physics, Eotvos University
2007/10 - 2008/10	research assistant, Eotvos University (supervisor: G. Vattay)
2004/09 - 2007/08	PhD student, Eotvos University (supervisor: J. Cserti)
2004	Diploma, Physics, Eotvos University

Book

J. K. Asboth, L. Oroszlany, A. Palyi
A Short Course on Topological Insulators: Band structure and edge states in one and two dimensions
Lecture Notes in Physics 919, Springer (2016), [arXiv]

Publications

1. D. Pataki, A. Palyi
   Compiling the surface code to crossbar spin qubit architectures
   [arXiv]
2. G. Pinter, Gy. Frank, D. Varjas, A. Palyi
   The geometry of the Hermitian matrix space and the Schrieffer--Wolff transformation
   [arXiv]
3. G. Naselli, Gy. Frank, D. Varjas, I. C. Fulga, G. Pinter, A. Palyi, V. Konye
   Stability of Weyl node merging processes under symmetry constraints
   Phys. Rev. Lett. 133, 196602 (2024) [arXiv]
4. F. Fedele, F. Cerisola, L. Bresque, F. Vigneau, J. Monsel, J. Tabanera, K. Aggarwal, J. Dexter, S. Sevitz, J. Dunlop, A. Auffeves, J. Parrondo, A. Palyi, J. Anders, N. Ares
   Coupling a single spin to high-frequency motion
   [arXiv]
5. D. Pataki, A. Marton, J. Asboth, A. Palyi
   Coherent errors in stabilizer codes caused by quasistatic phase damping
   Phys. Rev. A 110, 012417 (2024) [arXiv]
6. Gy. Frank, G. Pinter, A. Palyi
   Singularity theory of Weyl-point creation and annihilation
   [arXiv]
7. B. Kolok, A. Palyi
   Protocols to measure the non-Abelian Berry phase by pumping a spin qubit through a quantum-dot loop
   Phys. Rev. B 109, 045438 (2024) [arXiv]
8. V. John, F. Borsoi, Z. Gyorgy, C.-A. Wang, G. Szechenyi, F. van Riggelen, W. I. L. Lawrie, N. W. Hendrickx, A. Sammak, G. Scappucci, A. Palyi, M. Veldhorst
   Bichromatic Rabi control of semiconductor qubits
   Phys. Rev. Lett. 132, 067001 (2024) [arXiv]
9. A. Sen, Gy. Frank, B. Kolok, J. Danon, A. Palyi
   Classification and magic magnetic-field directions for spin-orbit-coupled double quantum dots
   Phys. Rev. B 108, 245406 (2023) [arXiv]
10. P. Boross, A. Palyi
    Braiding-based quantum control of a Majorana qubit built from quantum dots
    Phys. Rev. B 109, 125410 (2024) [arXiv]
11. Z. Guba, Gy. Frank, G. Pinter, A. Palyi
    Weyl points in ball-and-spring mechanical systems
    [arXiv]
12. F. K. Malinowski, R. K. Rupesh, L. Pavesic, Z. Guba, D. de Jong, L. Han, C. G. Prosko, M. Chan, Y. Liu, P. Krogstrup, A. Palyi, R. Zitko, J. V. Koski
    Quantum capacitance of a superconducting subgap state in an electrostatically floating dot-island
    [arXiv]
13. Z. Guba, I. Finta, A. Budai, L. Farkas, Z. Zimboras, A. Palyi
    Resource analysis for quantum-aided Byzantine agreement with the four-qubit singlet state
    Quantum 8, 1324 (2024) [arXiv]
14. Z. Gyorgy, A. Palyi, G. Szechenyi
    Electrically driven spin resonance with bichromatic driving
    Phys. Rev. B 106, 155412 (2022) [arXiv]
15. G. Pinter, Gy. Frank, D. Varjas, A. Palyi
    Upper bound on the number of Weyl points born from a nongeneric degeneracy point
    Phys. Rev. B 110, 245124 (2024) [arXiv]
16. Gy. Frank, D. Varjas, G. Pinter, A. Palyi
    Weyl-point teleportation
    Phys. Rev. B 109, 205415 (2024) [arXiv]
17. Z. Scherubl, G. Fulop, J. Gramich, A. Palyi, C. Schonenberger, J. Nygard, Sz. Csonka
    From Cooper pair splitting to the non-local spectroscopy of a Shiba state
    Phys. Rev. Research 4, 023143 (2022) [arXiv]
18. P. Boross, A. Palyi
    Dephasing of Majorana qubits due to quasistatic disorder
    Phys. Rev. B 105, 035413 (2022) [arXiv]
19. Gy. Frank, D. Varjas, P. Vrana, G. Pinter, A. Palyi
    Topological charge distributions of an interacting two-spin system
    Phys. Rev. B 105, 035414 (2022) [arXiv]
20. D. Bouman, R. J. J. van Gulik, G. Steffensen, D. Pataki, P. Boross, P. Krogstrup, J Nygard, J. Paaske, A. Palyi, A. Geresdi
    Triplet-blockaded Josephson supercurrent in double quantum dots
    Phys. Rev. B 102, 220505 (2020) [arXiv]
21. V. Derakhshan Maman, M. F. Gonzalez-Zalba, A. Palyi
    Charge noise and overdrive errors in dispersive readout of charge, spin and Majorana qubit readout
    Phys. Rev. Applied 15, 064024 (2020) [arXiv]
22. Gy. Frank, Z. Scherubl, Sz. Csonka, G. Zarand, A. Palyi
    Magnetic degeneracy points in interacting two-spin systems: geometrical patterns, topological charge distributions, and their stability
    Phys. Rev. B 101, 245409 (2020) [arXiv]
23. G. Szechenyi, A. Palyi
    Parity-to-charge conversion for readout of topological Majorana qubits
    Phys. Rev. B 101, 235441 (2020) [arXiv]
24. B. Hetenyi, P. Boross, A. Palyi
    Hyperfine-assisted decoherence of a phosphorus nuclear-spin qubit in silicon
    Phys. Rev. B 100, 115435 (2019) [arXiv]
25. P. Boross, J. K. Asboth, G. Szechenyi, L. Oroszlany, A. Palyi
    Poor man's topological quantum gate based on the Su-Schrieffer-Heeger model
    Phys. Rev. B 100, 045414 (2019) [arXiv]
26. Z. Scherubl, A. Palyi, Sz. Csonka
    Transport signatures of an Andreev molecule in a quantum dot -- superconductor -- quantum dot setup
    Beilstein J. Nanotechnol. 10, 363 (2019) [arXiv]
27. Z. Scherubl, A. Palyi, Gy. Frank, I. Lukacs, G. Fulop, B. Fulop, J. Nygard, K. Watanabe, T. Taniguchi, G. Zarand, Sz. Csonka
    Observation of spin-orbit coupling induced Weyl points in a two-electron double quantum dot
    Comms. Phys. 2, 108 (2019) [arXiv]
28. M. T. Veszeli, A. Palyi
    Fast electron spin flips via strong subcycle electric excitation
    Phys. Rev. B 97, 235433 (2018) [arXiv]
29. J. V. Koski, A. J. Landig, A. Palyi, P. Scarlino, C. Reichl, W. Wegscheider, G. Burkard, A. Wallraff, K. Ensslin, T. Ihn
    Floquet spectroscopy of a strongly driven quantum dot charge qubit with a microwave resonator
    Phys. Rev. Lett. 121, 043603 (2018) [arXiv]
30. P. Udvarhelyi, V. O. Shkolnykov, A. Gali, G. Burkard, A. Palyi
    Spin-strain interaction in nitrogen-vacancy centers in diamond
    Phys. Rev. B 98, 075201 (2018) [arXiv]
31. G. Szechenyi, L. Chirolli, A. Palyi
    Impurity-assisted electric control of spin-valley qubits in monolayer MoS2
    2D Materials 5, 035004 (2018) [arXiv]
32. P. Boross, G. Szechenyi, A. Palyi
    Hyperfine-assisted fast electric control of dopant nuclear spins in semiconductors
    Phys. Rev. B 97, 245417 (2018) [arXiv]
33. G. Szechenyi, A. Palyi, M. Droth
    Electron-electron attraction in an engineered electromechanical system
    Phys. Rev. B 96, 245302 (2017) [arXiv]
34. G. Szechenyi, A. Palyi
    Coulomb-blockade and Pauli-blockade magnetometry
    Phys. Rev. B 95, 035431 (2017) [arXiv]
35. T. Pei, A. Palyi, M. Mergenthaler, N. Ares, A. Mavalankar, J. H. Warner, G. A. D. Briggs, E. A. Laird
    Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube
    Phys. Rev. Lett. 118, 177701 (2017) [arXiv]
36. P. Boross, G. Szechenyi, D. Culcer, A. Palyi
    Control of valley dynamics in silicon quantum dots in the presence of an interface step
    Phys. Rev. B 94, 035438 (2016) [arXiv]
37. P. Boross, G. Szechenyi, A. Palyi
    Valley-enhanced fast relaxation of gate-controlled donor qubits in silicon
    Nanotechnology 27, 314002 (2016) [arXiv], in Focus Collection on Quantum Information Processing
38. J. K. Asboth, L. Oroszlany, A. Palyi
    A Short Course on Topological Insulators: Band structure and edge states in one and two dimensions
    Lecture Notes in Physics 919, Springer (2016) [arXiv]
39. J. Romhanyi, G. Burkard, A. Palyi
    Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance
    Phys. Rev. B 92, 054422 (2015) [arXiv]
40. P. Boross, A. Palyi
    Valley relaxation in graphene due to charged impurities
    Phys. Rev. B 92, 035420 (2015) [arXiv]
41. G. Szechenyi, A. Palyi
    Shape-sensitive Pauli blockade in a bent carbon nanotube
    Phys. Rev. B 91, 045431 (2015) [arXiv]
42. G. Csiszar, A. Palyi
    Orbital hyperfine interaction and qubit dephasing in carbon nanotube quantum dots
    Phys. Rev. B 90, 245413 (2014) [arXiv]
43. Z. Scherubl, A. Palyi, Sz. Csonka
    Probing individual split Cooper pairs using the spin qubit toolkit
    Phys. Rev. B 89, 205439 (2014) [arXiv]
44. G. Szechenyi, A. Palyi
    Maximal Rabi frequency of an electrically driven spin in a disordered magnetic field
    Phys. Rev. B 89, 115409 (2014) [arXiv]
45. G. Szechenyi, A. Palyi
    Current hot spot in the spin-valley blockade in carbon nanotubes
    Phys. Rev. B 88, 235414 (2013), [arXiv]
46. P. Rakyta, A. Palyi, J. Cserti
    Electronic standing waves on the surface of the topological insulator Bi2Te3
    Phys. Rev. B 86, 085456 (2012), [arXiv]
47. A. Palyi, P. R. Struck, M. Rudner, K. Flensberg, G. Burkard
    Spin-orbit induced strong coupling of a single spin to a nanomechanical resonator
    Phys. Rev. Lett. 108, 206811 (2012), [arXiv], also covered in Physical Review Focus and at PhysOrg.
48. A. Kiss, A. Palyi, Y. Ihara, P. Wzietek, H. Alloul, P. Simon, V. Zolyomi, J. Koltai, J. Kurti, B. Dora, F. Simon
    Enhanced NMR relaxation of Tomonaga-Luttinger liquids and the magnitude of the carbon hyperfine coupling in single-wall carbon nanotubes
    Phys. Rev. Lett. 107, 187204 (2011), [arXiv]
49. A. Palyi, G. Burkard
    Disorder-mediated electron valley resonance in carbon nanotube quantum dots
    Phys. Rev. Lett. 106, 086801 (2011), [arXiv]
50. A. Palyi, G. Burkard
    Spin-valley blockade in carbon nanotube double quantum dots
    Phys. Rev. B 82, 155424 (2010)
51. Cs. Peterfalvi, A. Palyi, A. Rusznyak, J. Koltai, J. Cserti
    Catastrophe optics of caustics in single and bilayer graphene: Fine structure of caustics
    physica status solidi (b), 247, 2949 (2010)
52. A. Palyi, G. Burkard
    Hyperfine-induced valley mixing and the spin-valley blockade in carbon-based quantum dots
    Phys. Rev. B 80, 201404(R) (2009)
53. Cs. Peterfalvi, A. Palyi, J. Cserti
    Electron flow in circular n-p junctions of bilayer graphene
    Phys. Rev. B 80, 075416 (2009)
54. T. G. Tenev, A. Palyi, B. I. Mirza, G. R. Nash, M. Fearn, S. J. Smith, L. Buckle, M. T. Emeny, T. Ashley, J. H. Jefferson, C. J. Lambert
    Energy level spectroscopy of InSb quantum wells using quantum-well LED emission
    Phys. Rev. B 79, 085301 (2009)
55. A. Palyi, J. Cserti
    Spin-dependent electron-impurity scattering in two-dimensional electron systems
    Phys. Rev. B 78, 241304(R) (2008)
56. J. Cserti, A. Palyi, Cs. Peterfalvi
    Caustics due to a Negative Refractive Index in Circular Graphene p-n Junctions
    Phys. Rev. Lett. 99, 246801 (2007)
57. A. Palyi, J. Cserti
    Skew scattering due to intrinsic spin-orbit coupling in a two-dimensional electron gas
    Phys. Rev. B 76, 035331 (2007)
58. A. Csordas, J. Cserti, A Palyi, U. Zuelicke
    Rashba billiards
    Eur. Phys. J. B 54, 189 (2006)
59. A. Palyi, Cs. Peterfalvi, J. Cserti
    Two-dimensional electron scattering in regions of nonuniform spin-orbit coupling
    Phys. Rev. B 74, 073305 (2006)

For group members

Funding acknowledgment, QNL (source): This research was supported by the Ministry of Culture and Innovation and the National Research, Development and Innovation Office within the Quantum Information National Laboratory of Hungary (Grant No. 2022-2.1.1-NL-2022-00004).

Funding acknowledgment, IGNITE: This research was supported by the European Union within the Horizon Europe research and innovation programme via the IGNITE project. OR The IGNITE project has received funding from the European Union's Horizon Europe research and innovation programme.

Funding acknowledgment, ONCHIPS: This research was supported by the European Union within the Horizon Europe research and innovation programme via the ONCHIPS project under grant agreement No 101080022. OR The ONCHIPS project has received funding from the European Union's Horizon Europe research and innovation programme under grant agreement No 101080022.

Funding acknowledgment, HUN-REN (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 for all group members: Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary

Extra affiliation for Andras: HUN-REN-BME-BCE Quantum Technology Research Group, 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. Seminar of the Department of Theoretical Physics, Fridays 10:15-11:15, seminar room of the theory department.