Andras Palyi

associate professor
Department of Theoretical Physics
MTA-BME Quantum Dynamics and Correlations 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

• 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• 2024/10/18 - I gave a talk at the 10th Physics Meets Philosophy workshop about our unpublished work "Qubit measures qubit: A minimal model for qubit readout".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 gives 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 gives 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 (2024 Fall)

• Dr. Gergo Pinter (postdoc)
• Akos Budai (PhD student, co-supervised with Zoltan Zimboras)
• Gyorgy Frank (PhD student)
• Baksa Kolok (PhD student)
• David Pataki (PhD student)
• 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 Fall 2024, 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, 2024 Fall

• Natalia Ares (Oxford)
• Janos Asboth (BME Budapest)
• Stefano Bosco (TU Delft)
• Guido Burkard (Konstanz)
• Ion Cosma Fulga (IFW Dresden)
• 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, 2024 Fall

• 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

Teaching

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

2022, Spring semester

• Topological insulators 2 (Topological superconductors), lecture for physics MSc and PhD students at ELTE and BME (with Janos Asboth and Laszlo Oroszlany)
• 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

• D. Pataki, A. Palyi
  Compiling the surface code to crossbar spin qubit architectures
  [arXiv]
• G. Pinter, Gy. Frank, D. Varjas, A. Palyi
  The geometry of the Hermitian matrix space and the Schrieffer--Wolff transformation
  [arXiv]
• 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]
• 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]
• 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]
• Gy. Frank, G. Pinter, A. Palyi
  Singularity theory of Weyl-point creation and annihilation
  [arXiv]
• 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]
• 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]
• 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]
• P. Boross, A. Palyi
  Braiding-based quantum control of a Majorana qubit built from quantum dots
  Phys. Rev. B 109, 125410 (2024) [arXiv]
• Z. Guba, Gy. Frank, G. Pinter, A. Palyi
  Weyl points in ball-and-spring mechanical systems
  [arXiv]
• 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]
• 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]
• Z. Gyorgy, A. Palyi, G. Szechenyi
  Electrically driven spin resonance with bichromatic driving
  Phys. Rev. B 106, 155412 (2022) [arXiv]
• 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]
• Gy. Frank, D. Varjas, G. Pinter, A. Palyi
  Weyl-point teleportation
  Phys. Rev. B 109, 205415 (2024) [arXiv]
• 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]
• P. Boross, A. Palyi
  Dephasing of Majorana qubits due to quasistatic disorder
  Phys. Rev. B 105, 035413 (2022) [arXiv]
• 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]
• 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]
• 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]
• 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]
• G. Szechenyi, A. Palyi
  Parity-to-charge conversion for readout of topological Majorana qubits
  Phys. Rev. B 101, 235441 (2020) [arXiv]
• B. Hetenyi, P. Boross, A. Palyi
  Hyperfine-assisted decoherence of a phosphorus nuclear-spin qubit in silicon
  Phys. Rev. B 100, 115435 (2019) [arXiv]
• 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]
• 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]
• 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]
• M. T. Veszeli, A. Palyi
  Fast electron spin flips via strong subcycle electric excitation
  Phys. Rev. B 97, 235433 (2018) [arXiv]
• 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]
• 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]
• G. Szechenyi, L. Chirolli, A. Palyi
  Impurity-assisted electric control of spin-valley qubits in monolayer MoS2
  2D Materials 5, 035004 (2018) [arXiv]
• P. Boross, G. Szechenyi, A. Palyi
  Hyperfine-assisted fast electric control of dopant nuclear spins in semiconductors
  Phys. Rev. B 97, 245417 (2018) [arXiv]
• G. Szechenyi, A. Palyi, M. Droth
  Electron-electron attraction in an engineered electromechanical system
  Phys. Rev. B 96, 245302 (2017) [arXiv]
• G. Szechenyi, A. Palyi
  Coulomb-blockade and Pauli-blockade magnetometry
  Phys. Rev. B 95, 035431 (2017) [arXiv]
• 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]
• 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]
• 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
• 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]
• J. Romhanyi, G. Burkard, A. Palyi
  Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance
  Phys. Rev. B 92, 054422 (2015) [arXiv]
• P. Boross, A. Palyi
  Valley relaxation in graphene due to charged impurities
  Phys. Rev. B 92, 035420 (2015) [arXiv]
• G. Szechenyi, A. Palyi
  Shape-sensitive Pauli blockade in a bent carbon nanotube
  Phys. Rev. B 91, 045431 (2015) [arXiv]
• G. Csiszar, A. Palyi
  Orbital hyperfine interaction and qubit dephasing in carbon nanotube quantum dots
  Phys. Rev. B 90, 245413 (2014) [arXiv]
• Z. Scherubl, A. Palyi, Sz. Csonka
  Probing individual split Cooper pairs using the spin qubit toolkit
  Phys. Rev. B 89, 205439 (2014) [arXiv]
• G. Szechenyi, A. Palyi
  Maximal Rabi frequency of an electrically driven spin in a disordered magnetic field
  Phys. Rev. B 89, 115409 (2014) [arXiv]
• G. Szechenyi, A. Palyi
  Current hot spot in the spin-valley blockade in carbon nanotubes
  Phys. Rev. B 88, 235414 (2013), [arXiv]
• P. Rakyta, A. Palyi, J. Cserti
  Electronic standing waves on the surface of the topological insulator Bi2Te3
  Phys. Rev. B 86, 085456 (2012), [arXiv]
• 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.
• 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]
• A. Palyi, G. Burkard
  Disorder-mediated electron valley resonance in carbon nanotube quantum dots
  Phys. Rev. Lett. 106, 086801 (2011), [arXiv]
• A. Palyi, G. Burkard
  Spin-valley blockade in carbon nanotube double quantum dots
  Phys. Rev. B 82, 155424 (2010)
• 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)
• 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)
• Cs. Peterfalvi, A. Palyi, J. Cserti
  Electron flow in circular n-p junctions of bilayer graphene
  Phys. Rev. B 80, 075416 (2009)
• 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)
• A. Palyi, J. Cserti
  Spin-dependent electron-impurity scattering in two-dimensional electron systems
  Phys. Rev. B 78, 241304(R) (2008)
• 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)
• A. Palyi, J. Cserti
  Skew scattering due to intrinsic spin-orbit coupling in a two-dimensional electron gas
  Phys. Rev. B 76, 035331 (2007)
• A. Csordas, J. Cserti, A Palyi, U. Zuelicke
  Rashba billiards
  Eur. Phys. J. B 54, 189 (2006)
• 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, OTKA: This research was supported by the National Research, Development and Innovation Office via the OTKA Grant No. 132146.

Funding acknowledgment, HUN-REN: This project has received funding from the HUN-REN Hungarian Research Network.

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 Quantum Dynamics and Correlations Research Group, Műegyetem rkp. 3., H-1111 Budapest, Hungary

Regular events:

1. IGNITE / ONCHIPS Meeting, Mondays 14:15-15:30, library.
2. Szilard Colloquium, Tuesdays 14:30-15:30, lecture hall F 13.
3. Quantum Error Correction / OpenSuperQPlus Meeting, Wednesdays 14:15-15:45, seminar room of physics department.
4. Seminar or the Department of Theoretical Physics, Fridays 10:15-11:15, seminar room of the theory department.
5. Topology and Physics Discussion, Wednesdays 12:30-14:00, coffee corner of the theory department.