Quantum Computation Concepts – QuantumFrontiers

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

Publications

Tan 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-2022-12-22-880

Zhang 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: 10.48550/arXiv.2110.00575, 10.1038/s41586-022-04891-y

Dubielzig 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: 10.1063/5.0024423

Gnezdilov 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.104.165118

Madsen 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.103.115142

Beer 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, 10.15488/9906

Bridgeman 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

Chabuda 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, 10.15488/10595

Decker 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.101.014208

Park 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.125.187702

Schuray 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/e2019-900150-7

Yerokhin 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.101.012502

Hahn 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. Epub 2019 Aug 16. doi: 10.1038/s41534-019-0184-5, 10.15488/9283

TG Members

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

All Topical Groups

FOUNDATIONS OF METROLOGY

APPLICATIONS IN METROLOGY

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