Quantum Control

Utilising the full potential of quantum physics for practical quantum technologies requires control. We are investigating novel control strategies and algorithms, not just to stabilise the dynamics of a system, but to design a system operating efficiently and robustly. This is often linked to system identification and learning techniques.

      Publications

      • A.A. Rompokos, F.C. Langbein, E.A. Jonckheere. Information Transfer in Spintronics Networks under Worst Case Uncertain Parameter Errors. IEEE Conf Decision and Control, in press, 2022.

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      • C.A. Weidner, S.G. Schirmer, F.C. Langbein, E.A. Jonckheere. Applying Classical Control Techniques to Quantum Systems: Entanglement versus Stability Margin and other Limitations. IEEE Conf Decision and Control, in press, 2022.

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      • I. Khalid, C. A. Weidner, E. A. Jonckheere, S. G. Shermer, F. C. Langbein. Statistically Characterising Robustness and Fidelity of Quantum Controls and Quantum Control Algorithms. Preprint, 2022.

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      • F.C. Langbein. Learning to Control Quantum Systems Robustly. AI3SD Video: Learning to Control Quantum Systems Robustly, 10/11/2021. AI3SD Autumn Seminar Series 2021. 13 Oct – 15 Dec 2021.

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      • Irtaza Khalid, Carrie Weidner, S.G. Schirmer, Edmond Jonckheere, Frank C. Langbein. Finding and Characterising Robust Quantum Controls. Poster, BQIT:22, 2022.

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      • E. Jonckheere, S. G. Schirmer, F. C. Langbein, C. A. Weidner. Noiseless robust performance with structured uncertainties and initial state error. Preprint 2022.

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      • SG Schirmer, FC Langbein, CA Weidner, EA Jonckheere. Robustness of Quantum Systems Subject to Decoherence: Structured Singular Value Analysis?. IEEE Conf Decision and Control, pp. 4158-4163, 2021.

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      • Irtaza Khalid, Carrie Weidner, S.G. Schirmer, Edmond Jonckheere, Frank C. Langbein. Finding and Characterising Robust Quantum Controls. Poster, European Quantum Technologies Conference EQTC, 2021.

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      • I. Khalid, C. A. Weidner, E. A. Jonckheere, S. G. Schirmer, F. C. Langbein. Reinforcement Learning vs. Gradient-Based Optimisation for Robust Energy Landscape Control of Spin-1/2 Quantum Networks. IEEE Conf Decision and Control, pp. 4133-4139, 2021.

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      • Sophie G. Schirmer, Frank C. Langbein, Carrie A. Weidner, Edmond Jonckheere. Robust Control Performance for Open Quantum Systems. In press, DOI:10.1109/TAC.2022.3181249, 2022.

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      • Sean O’Neil, Edmond Jonckheere, Sophie Schirmer, Frank Langbein. Sensitivity and Robustness of Quantum Spin-1/2 Rings to Parameter Uncertainty. Proc. IEEE 56th Annual Conference on Decision and Control (CDC), Melbourne, VIC, pp. 6137-6142, 2017.

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      • E. A. Jonckheere, S. G. Schirmer, F.C. Langbein. Structured Singular Value Analysis for Spintronics network Information Transfer Control. IEEE Trans Automatic Control, 62(12):6568-6574, 2017.

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      • E. Jonckheere, S. G. Schirmer, F.C. Langbein. Jonckheere-Terpstra test for nonclassical error versus log-sensitivity relationship of quantum spin network controllers. Int J Robust and Nonlinear Control, 28(6):2383-2403, 2018.

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      • F. C. Langbein, S. G. Schirmer, E. Jonckheere. Time optimal information transfer in spintronics networks. Proc. IEEE 54th Annual Conference on Decision and Control (CDC), pp. 6454-6459, Osaka, Japan, December 15-18, 2015.

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      • S. G. Schirmer, F. C. Langbein. Characterization and Control of Quantum Spin Chains and Rings. In: Proc. 6th Int Symp Communications, Control and Signal Processing (ISCCSP), pp. 615 – 619, May 2014.

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      Presentations

      • F.C. Langbein. Learning to Control Quantum Systems Robustly. AI3SD Video: Learning to Control Quantum Systems Robustly, 10/11/2021. AI3SD Autumn Seminar Series 2021. 13 Oct – 15 Dec 2021.

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      • Irtaza Khalid, Carrie Weidner, S.G. Schirmer, Edmond Jonckheere, Frank C. Langbein. Finding and Characterising Robust Quantum Controls. Poster, BQIT:22, 2022.

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      • Irtaza Khalid, Carrie Weidner, S.G. Schirmer, Edmond Jonckheere, Frank C. Langbein. Finding and Characterising Robust Quantum Controls. Poster, European Quantum Technologies Conference EQTC, 2021.

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      Codes

          Partners

          Funding

          • September 2018 – August 2020: US-UK International Student Research in Robust Control of Quantum Networks. PI: E Jonckheere (University of Southern California) with SG Schirmer (Swansea University) and FC Langbein (Cardiff University). NSF #1829078 OISE IRES ASI – Track II. USD164,503.

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          • January 2015 – December 2017: Data-Driven Simulation of Quantum Spin Network Devices. PI: F. C. Langbein with S. G. Schirmer (Swansea University), K. Kalna (Swansea University), A. Martinez (Swansea University), D. Burgarth (Aberystwyth University). £120K.

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          • August 2014 – August 2015: Cardiff University Research Leave Fellowship. Teaching replacement costs and £3,000 support.

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          • August 2012 – July 2015: QUAINT – Optimal Control Technologies in Quantum Information Processing. Coordinator: University of Southampton (I. Kuprov) with Univerzita Karlova v Praze, Czech Republic, Universität Ulm, Germany, Karlsruher Institut fuer Technologie, Germany, Universität des Saarlandes, Germany, Universität Kassel, Germany, Technisch Universität München, Germany, Aarhus Universitet, Denmark, Universite de Bourgogne, France, Centre National de la Recherche Scientifique, France, The Hebrew University of Jerusalem, Israel, Weizmann Institute of Science, Israel, The University of Nottingham, UK, Cardiff University, UK, Swansea University, UK. FP7-ICT-2011-C, ICT-2011.9.1 – Challenging current Thinking, CSA – Coordination & support action, ref 297861. EUR 399,901.

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          • 2009-2013: RIVIC: One Wales Research Institute for Visual Computing. WAG (HEFCW) via Bangor University. Consortium: R. R. Martin, N. J. Avis, A. D. Marshall, P. L. Rosin, F. C. Langbein at Cardiff University, with Bangor University (lead), Aberystwyth University, Swansea University. £998,011.

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