Quantum Device Theory (QDT) Group🐝 Updates:💡   

• > A new preprint! Suppressing Frequency Collisions in a Quantum Processor Kuljeet Kaur, Xuexin Xu, Mohammad Ansari
  https://doi.org/10.48550/arXiv.2610.06264 (OCT 2026)

• > New on arXiv!  Parametric two-qubit gates via Landau-Zener interference, S Geisert, A Hertel, S Ihssen, Zhongyi Jiang, P Kugler, N Zapata, NGosling, A Nambisan, Y Gao, A Galicia, J Guimarães, Y Haddad, M Neis, H Bhardwaj, D Volkov, J Cereijo, M Guardascione, Y Liu, M Jerger, P Bushev, F Wilhelm, W Wernsdorfer, S Machnes, Mohammad Ansari, Rami Barends, Ioan M. Pop
  https://doi.org/10.48550/arXiv.2609.15604 (SEP 2026)

• >New on ArXiv!  Entropy Transport in Programmable Quantum Junctions,
  Radhika joshi, Yuli V. Nazarov, Mohammad H. Ansari,
  https://doi.org/10.48550/arXiv.2607.12581 (14 July 2026)

• > 🗞️ lnterview with Nobel Laureate of Physics 2025 John Martinis about superconducting qubits and our collab  (Aug 2026)
  > 🗞️ Taming Quantim Chip Interactions FZJ News (July 2026) + Insider

• > 🚣 Julian Roschke from University of Cologne has startd his Master thesis at QDT group, Welcome onboard Julius! 

• > 🎓 Congratulation to Dr. Zhongyi Jiang for successfully defending his PhD thesis at RWTH Aachen University in June 2026! 

• >  Scientific Reports 16, 22952 (2026):
  Tobias Kempe,  Ali Tabei,  Mohammad Ansari  Formation of topologically associated chromatin domains using quantum annealing ( May 2026)  

• >  npj Quantum Information 12, 71 (2026): Xuexin Xu, Kuljeet Kaur, C. Vignes, John M. Martinis & Mohammad Ansari  Surface-code hardware Hamiltonian  (April 2026)

• >  Phys. Rev. Applied 25, 044045 (2026): Xuexin Xu, Siyu Wang, Radhika Joshi, Rihan Hai, Mohammad H. Ansari Multiqubit gate based on parity cross resonance (April 2026)

• > Quantum Devices with Left-Handed Ring Resonators, Britton Plourde, Mohammad Ansari, Tianna McBroom, Xuexin Xu, Arne Schlabes, US Patent 18225837 (Oct 2025)

• > Enabling full localization of qubits and gates with a multi-mode coupler,   Zhongyi Jiang, Simon Geisert, Sören Ihssen, Ioan M. Pop, Mohammad H. Ansari.  arXiv.2509.26211   Public Summary (Oct 2025)

• > Parity Cross Resonance (PCR): A Multi-Qubit Gate,   X. Xu, S. Wang, R. Joshi, R. Hai, M. H. Ansari arXiv:2508.10807  Public Summary   (Aug 2025)

• > Information Transport in Classic-Quantum Hybrid System,    J. Rapp, R. Joshi, A. van Steensel, Yuli Nazarov & M. H. Ansari arXiv:2508.07870  Public Summary (11 Aug 2025) 

• > Surface-Code Hardware Hamiltonian,    X. Xu, K. Kaur, C. Vignes, M.H. Ansari &  John M. Martinis,  arxiv:2507.06201 Public Summary  (Aug 2025)

• > Concurrent fermionic simulation gate,  Zhongyi Jiang & Mohammad Ansari  Phys. Rev. Applied 24, 024050 (2025) DOI  Public Summary (Aug 2025)

• > Intermediate State Formation of Topologically Associated Chromatin Domains using Quantum Annealing, Tobias Kempe, Ali Tabei & M.H. Ansari  arXiv:2505.23289   Public Summary  (June 2025)

• > Our "Quantum Device Theory" group page at Forschungszentrum Jülich (Mar 2025)

• > A new PhD student joined our team. Welcome on board Ms. Siyu Wang! (Dec 2024)

• > Lattice Hamiltonians and stray interactions within quantum processors     X. Xu, Manabputra, C. Vignes, M. Ansari & John M. Martinis, Phys. Rev. Applied DOI   Public Summary  (Dec 2024)

• > Fast Gates of Detuned Cat Qubit    Arne Schlabes, Rahul Bhowmick & M. H. Ansari arxiv:2407.20820 (Aug 2024)

• > A new Postdoc joined our team, Welcome on board Dr. Kuljeet Kaur! (July 2024)

• ...older news.

Reseserch topics:

• • - Scalable superconducting qubits (models, theory, and foundation),

  • - New frontiers in quantum error correction and error mitigation with advantages for computing

  • - Many body simulation on large quantum processors and new phases of matter

  • - Quantum sensing and modern circuit quantum electrodynamics

  • Correspondence between information and physics

  • - Solid-state quantum devices, e.g. topological phase slip, photovoltaic cells, light-harvesting photosynthetic complexes, etc.,

  • - Quantum field theory and non-equilibrium statistical physics,

  • more about quantum information and computing in our institute ...,

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