Deliverables Documents, reports (13) Develop low-resource trapped-ion schemes for fault-tolerant key building blocks Develop low-resource trapped-ion schemes for fault-tolerant key building blocks (flag-based QEC, FT teleportation and distillation between 2 processing units, comparative study of shuttling- and photon-based interconnects). Demonstrate quantum optimization or machine learning algorithm for > 30 qubits Demonstrate quantum optimization or machine learning algorithm for 30 qubits Demonstrate advanced entanglement purification techniques by purifying a higher order object than a Bell state Demonstrate advanced entanglement purification techniques by purifying a higher order object than a Bell state an appropriate small code state Establish techniques for automated optimisation/discovery of shallow circuits; verify numerically and begin testing with quantum hardware Parallel ion reconfiguration operations on a 50 qubit register Demonstrate combined LGT ground state generation and dynamics simulation > 30 qubits Demonstrate combined LGT ground state generation and dynamics simulation 30 qubits Describe an efficient decoder for flag-based QEC with larger-distance codes Describe an efficient decoder for flagbased QEC with largerdistance codes scalability of future trappedion technologies with more than 100 qubits Entanglement rate between two remote traps > 100 ebits/s Entanglement rate between two remote traps 100 ebitss Demonstrate random circuit experiment with > 40 qubits using quantum error mitigation methods Demonstrate random circuit experiment with 40 qubits using quantum error mitigation methods circuit depth 40 Experimental results on benchmarking of single FT building blocks and verification of quantum advantage Demonstrate a quantum logic gate on multiple logical qubits Identify scalable discrete noise models Develop a set of lattice-surgery-inspired methods for code-switching protocols for a FT universal set of gates Develop a set of latticesurgeryinspired methods for codeswitching protocols for a FT universal set of gates Demonstrators, pilots, prototypes (4) Automated operation of the quantum computer demonstrator Automated operation of the quantum computer demonstrator with 50 qubits Feasibility study on integration of a fibre-cavity into the trap design Feasibility study on integration of a fibrecavity into the trap design Assembly of quantum computer demonstrator with 10 qubits 50-ion 3D trap with 2 junctions manufactured and produced 50ion 3D trap with 2 junctions manufactured and produced Websites, patent fillings, videos etc. (1) Final report on dissemination, exploitation and data management Final report on dissemination exploitation and data management Publications Other (5) Cross-verification of independent quantum devices Author(s): C. Greganti, T. F. Demarie, M. Ringbauer, J. A. Jones, V. Saggio, I. A. Calafell, L. A. Rozema, A. Erhard, M. Meth, L. Postler, R. Stricker, P. Schindler, R. Blatt, T. Monz, P. Walther, J. F. Fitzsimons Published in: 2019 Publisher: arXiv Preprint Phase Spaces, Parity Operators, and the Born-Jordan Distribution Author(s): Bálint Koczor, Frederik vom Ende, Maurice de Gosson, Steffen J. Glaser, Robert Zeier Published in: 2018 Publisher: arXiv preprint Quantum natural gradient generalised to non-unitary circuits Author(s): Bálint Koczor, Simon C. Benjamin Published in: 2019 Publisher: arXiv preprint Deterministic correction of qubit loss Author(s): Roman Stricker, Davide Vodola, Alexander Erhard, Lukas Postler, Michael Meth, Martin Ringbauer, Philipp Schindler, Thomas Monz, Markus Müller, Rainer Blatt Published in: 2020 Publisher: arXiv preprint Variational-State Quantum Metrology Author(s): Bálint Koczor, Suguru Endo, Tyson Jones, Yuichiro Matsuzaki, Simon C. Benjamin Published in: 2019 Publisher: arXiv preprint Peer reviewed articles (9) Shuttling-based trapped-ion quantum information processing Author(s): V. Kaushal, B. Lekitsch, A. Stahl, J. Hilder, D. Pijn, C. Schmiegelow, A. Bermudez, M. Müller, F. Schmidt-Kaler, U. Poschinger Published in: AVS Quantum Science, Issue 2/1, 2020, Page(s) 014101, ISSN 2639-0213 Publisher: AIP Publishing DOI: 10.1116/1.5126186 Probing Qubit Memory Errors at the Part-per-Million Level Author(s): M. A. Sepiol, A. C. Hughes, J. E. Tarlton, D. P. Nadlinger, T. G. Ballance, C. J. Ballance, T. P. Harty, A. M. Steane, J. F. Goodwin, D. M. Lucas Published in: Physical Review Letters, Issue 123/11, 2019, ISSN 0031-9007 Publisher: American Physical Society DOI: 10.1103/physrevlett.123.110503 Encoding a qubit in a trapped-ion mechanical oscillator Author(s): C. Flühmann, T. L. Nguyen, M. Marinelli, V. Negnevitsky, K. Mehta, J. P. Home Published in: Nature, Issue 566/7745, 2019, Page(s) 513-517, ISSN 0028-0836 Publisher: Nature Publishing Group DOI: 10.1038/s41586-019-0960-6 Characterizing large-scale quantum computers via cycle benchmarking Author(s): Alexander Erhard, Joel J. Wallman, Lukas Postler, Michael Meth, Roman Stricker, Esteban A. Martinez, Philipp Schindler, Thomas Monz, Joseph Emerson, Rainer Blatt Published in: Nature Communications, Issue 10/1, 2019, ISSN 2041-1723 Publisher: Nature Publishing Group DOI: 10.1038/s41467-019-13068-7 Continuous phase-space representations for finite-dimensional quantum states and their tomography Author(s): Bálint Koczor, Robert Zeier, Steffen J. Glaser Published in: Physical Review A, Issue 101/2, 2020, ISSN 2469-9926 Publisher: American Physical Society DOI: 10.1103/physreva.101.022318 Adaptive Bayesian phase estimation for quantum error correcting codes Author(s): F Martínez-García, D Vodola, M Müller Published in: New Journal of Physics, Issue 21/12, 2019, Page(s) 123027, ISSN 1367-2630 Publisher: Institute of Physics Publishing DOI: 10.1088/1367-2630/ab5c51 High-Rate, High-Fidelity Entanglement of Qubits Across an Elementary Quantum Network Author(s): L. J. Stephenson, D. P. Nadlinger, B. C. Nichol, S. An, P. Drmota, T. G. Ballance, K. Thirumalai, J. F. Goodwin, D. M. Lucas, C. J. Ballance Published in: Physical Review Letters, Issue 124/11, 2020, ISSN 0031-9007 Publisher: American Physical Society DOI: 10.1103/physrevlett.124.110501 Segmented ion-trap fabrication using high precision stacked wafers Author(s): Simon Ragg, Chiara Decaroli, Thomas Lutz, Jonathan P. Home Published in: Review of Scientific Instruments, Issue 90/10, 2019, Page(s) 103203, ISSN 0034-6748 Publisher: American Institute of Physics DOI: 10.1063/1.5119785 Magnetic field stabilization system for atomic physics experiments Author(s): B. Merkel, K. Thirumalai, J. E. Tarlton, V. M. Schäfer, C. J. Ballance, T. P. Harty, D. M. Lucas Published in: Review of Scientific Instruments, Issue 90/4, 2019, Page(s) 044702, ISSN 0034-6748 Publisher: American Institute of Physics DOI: 10.1063/1.5080093 Thesis and dissertations (3) A shuttling-based trapped-ion quantum processing node Author(s): Vidyut Kaushal Published in: 2019 Publisher: University of Mainz Advanced positioning control for trapped ions Author(s): Oliver Gräb Published in: 2019 Publisher: University of Mainz Simultaneous and individual ion addressing for quantum information processing Author(s): Julian Rickert Published in: 2018 Publisher: University of Innsbruck Searching for OpenAIRE data... 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