Development of concepts for realizing scalable quantum computers and their application.
Contributions to QuantumFrontiers
- Using the results of QuantumFrontiers Topical Groups to develop new quantum computing concepts
- Basic research on scalable quantum computers which stimulates a wide range of new applications and future spin-offs
- Identification of quantum computer tasks, which are of significant scientific interest and would enhance basic understanding of physics, chemistry, or material science
Collaborative Innovation
- Computing for Quantum: Developing Scalable Methods for Controlling and Utilizing Quantum Technologies for Metrology and (S. Fekete/TUBS, W. Nejdl/LUH, T. Osborne/LUH, R. Raußendorf/LUH)
- Quantum for Computing: Measuring the performance of quantum algorithm for achieving scalable and practical quantum advantage (S. Fekete/TUBS, W. Nejdl/LUH, T. Osborne/LUH, R. Raußendorf/LUH)
- Quantum Machine Learning: Reinforcement learning for the automation and discovery of quantum experiments (S. Fekete/TUBS, W. Nejdl/LUH, T. Osborne/LUH, R. Raußendorf/LUH)
- Optical quantum computation scaling technologies, that involve frequency conversion and entanglement of remote stationary qubits via optical qubits through fiber links over possibly long distances. This especially involves compiler research with the additional penalty accrued for valuable remote entangling procedures. (C. Osplekaus, LUH)
- Defining a roadmap towards scalable fault-tolerant quantum computers (L. Krinner PTB, D. Borcherding, LUH)
Scientific Output
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Publications
Toth P, Shine Eugine P, Kudabay Y, Yamashita K, Halama S, Parvizinejad J et al. A Cryo-BiCMOS Controller for Quantum Computers based on Trapped Beryllium Ions. IEEE Journal of Solid-State Circuits. 2026 Feb;61(2):673-689. Epub 2025 Dec 2. doi: 10.1109/JSSC.2025.3632204Tan EYZ, Sekatski P, Bancal JD, Schwonnek R, Renner R, Sangouard N et al. Improved DIQKD protocols with finite-size analysis. Quantum. 2022 Dec 22;6. doi: 10.22331/Q-2022-12-22-880Zhang W, van Leent T, Redeker K, Garthoff R, Schwonnek R, Fertig F et al. A device-independent quantum key distribution system for distant users. NATURE. 2022 Jul 28;607(7920):687-691. Epub 2022 Jul 27. doi: 10.1038/s41586-022-04891-y, 10.48550/arXiv.2110.00575Dubielzig T, Halama S, Hahn H, Zarantonello G, Niemann M, Bautista-Salvador A et al. Ultra-low-vibration closed-cycle cryogenic surface-electrode ion trap apparatus. Review of scientific instruments. 2021 Apr 13;92(4):043201. doi: 10.1063/5.0024423Gnezdilov V, Kurnosov V, Pashkevich Y, Bera AK, Islam ATMN, Lake B et al. Non-Abelian statistics in light-scattering processes across interacting Haldane chains. Physical Review B. 2021 Oct 11;104(16):165118. Epub 2021 Oct 11. doi: 10.1103/physrevb.104.165118Madsen KA, Brouwer PW, Recher P, Silvestrov PG. Interference effects induced by a precessing easy-plane magnet coupled to a helical edge state. Physical Review B. 2021 Mar 24;103(11):115142. doi: 10.1103/PhysRevB.103.115142Beer K, Bondarenko D, Farrelly T, Osborne TJ, Salzmann R, Scheiermann D et al. Training deep quantum neural networks. Nature Communications. 2020 Feb 10;11(1):808. 808. doi: 10.1038/s41467-020-14454-2, 10.15488/9906Bridgeman JC, Hahn A, Osborne TJ, Wolf R. Gauging defects in quantum spin systems: A case study. Physical Review B. 2020 Apr 27;101(13):134111. doi: 10.1103/PhysRevB.101.134111, 10.48550/arXiv.1910.10619Chabuda K, Dziarmaga J, Osborne TJ, Demkowicz-Dobrzański R. Tensor-network approach for quantum metrology in many-body quantum systems. Nature Communications. 2020 Jan 14;11(1):250. 250. doi: 10.1038/s41467-019-13735-9, 10.15488/10595Decker KSC, Kennes DM, Eisert J, Karrasch C. Entanglement and spectra in topological many-body localized phases. Physical Review B. 2020 Jan 24;101(1):014208. doi: 10.1103/PhysRevB.101.014208Park S, Sim HS, Recher P. Electron-Tunneling-Assisted Non-Abelian Braiding of Rotating Majorana Bound States. Physical review letters. 2020 Oct 28;125(18):187702. doi: 10.1103/PhysRevLett.125.187702Schuray A, Frombach D, Park S, Recher P. Transport signatures of Majorana bound states in superconducting hybrid structures: A minireview. European Physical Journal: Special Topics. 2020 Feb;229(4):593-620. Epub 2020 Feb 14. doi: 10.1140/epjst/e2019-900150-7Yerokhin VA, Müller RA, Surzhykov A, Micke P, Schmidt PO. Nonlinear isotope-shift effects in Be-like, B-like, and C-like argon. Physical Review A. 2020 Jan 6;101(1):012502. doi: 10.1103/PhysRevA.101.012502Hahn H, Zarantonello G, Schulte M, Bautista-Salvador A, Hammerer K, Ospelkaus C. Integrated 9Be+ multi-qubit gate device for the ion-trap quantum computer. npj Quantum information. 2019 Aug 16;5(1):70. doi: 10.1038/s41534-019-0184-5, 10.15488/9283
TG Members
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Involved Members and their Relevant Expertise
Members Institution Relevant Expertise René Schwonnek, Leader LUH Ludwig Krinner, Leader PTB Ion trapping, atomic physics, laboratory operation and automation, physical system modeling Christian Ospelkaus LUH / PTB Scalable Surface-Electrode Ion Traps; Integrated Microwave and RF Control Elements Jörg Schöbel TUBS Radio and Microwave Frequency Technologies Tobias Osborne LUH Tensor networks for many body localized systems Christoph Karrasch TUBS Tensor networks for many body localized systems Patrik Recher TUBS Theory of Emergent Correlated Quantum Matter; Josephson Junctions; Twisted Bilayer Graphene; Twisted-bilayer-graphene physics in ultracold atoms in optical potentials Wolfgang Nejdl LUH Sándor Fekete TUBS Peter Silvestrov TUBS Twisted Bilayer Graphene Wolfram Brenig TUBS strongly correlated electron systems, quantum transport, quantum critical systems, low dimensional quantum magnets Andrey Surzhykov PTB / TUBS Light-Matter Interfaces and Dynamics Peter Lemmens TUBS Propagation of Twisted Light through Media: New Possibilities for Information Transfer Timko Dubielzig LUH René Schwonnek LUH Tobias Schmale LUH Quantum algorithms; Quantum compilers; Quantum simulations Bence Temesi LUH Variational quantum algorithms; Quantum compilers Alakesh Baishya LUH Open quantum systems Nicolás Pulido LUH
