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Advanced quantum computing with trapped ions

Deliverables

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

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

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

Experimental results on benchmarking of single FT building blocks and verification of quantum advantage

Demonstrate a quantum logic gate on multiple logical qubits

Demonstrate a quantum logic gate on multiple logical qubits

Identify scalable discrete noise models

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

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

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

Publications

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

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

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

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