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Lieven Vandersypen: Simulating quantum magnetism with quantum dot Arrays
4 February 2020
Lieven Vandersypen - Professor at the Delft University of Technology, Netherlands.
Address / Location
MPI of Quantum Optics | Herbert Walther Lecture Hall
The MCQST Colloquium Series features interdisciplinary talks given by visiting international speakers. The monthly colloquial covers topics spanning all MCQST research units and will be broadcasted live, being made available to audiences worldwide. The main goal of the series is to create the framework for idea exchange, to strengthen links with QST leading groups worldwide, as well as to act as an integral part of the local educational environment.
On 4 February 2020 we are excited to welcome Lieven Vandersypen, Professor at the Delft University of Technology, Netherlands.
Simulating quantum magnetism with quantum dot Arrays
Finally, the accessible observables include particle number, spin, spin correlations, addition energies and transport, complementing those of cold atom experiments. As a first illustration, we show the transition from Coulomb blockade to collective Coulomb blockade, the finite-size analogue of the metal to Mott insulator transition . In a second experiment, we present evidence of Nagaoka ferromagnetism in a 2x2 quantum dot plaquette . This is a form of magnetism that has not been observed before, highlighting the potential of quantum dots to provide new insights in Fermi-Hubbard physics. I will close with an overview and outlook of our recent work on silicon spin qubits [3-5].
 T. Hensgens, T. Fujita, L. Janssen, Xiao Li, C.J. van Diepen, C. Reichl, W. Wegschneider, S. Das Sarma, L.M.K. Vandersypen, Quantum simulation of a Fermi-Hubbard model using a semiconductor quantum dot array
Nature 548, 70–73 (2017)
 J.P. Dehollain, U. Mukhopadhyay, V.P. Michal, Y. Wang, B. Wunsch, C. Reichl, W. Wegscheider, M.S. Rudner, E. Demler, and L.M.K. Vandersypen, Nagaoka ferromagnetism observed in a quantum dot plaquette, Nature, in print (see arXiv:1904.05680)
 T.F. Watson, S.G.J. Philips, E. Kawakami, D.R. Ward, P. Scarlino, M. Veldhorst, D.E. Savage, M.G. Lagally, M. Friesen, S.N. Coppersmith, M.A. Eriksson, and L.M.K. Vandersypen, A programmable two-qubit quantum processor in silicon, Nature 555, 633-637 (2018)
 N. Samkharadze, G. Zheng, N. Kalhor, D. Brousse, A. Sammak, U.C. Mendes, A. Blais, G. Scappucci, and L.M.K. Vandersypen, Strong spin-photon coupling in silicon, Science 359, 1123-1127 (2018)
 X. Xue, T.F. Watson, J. Helsen, D.R. Ward, D.E. Savage, M.G. Lagally, S.N. Coppersmith, M.A. Eriksson, S. Wehner, and L.M.K. Vandersypen, Benchmarking Gate Fidelities in a Si/SiGe Two-Qubit Device, Phys. Rev. X 9, 021011 (2019)
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The talk is open to everyone interested, no registration is required.