Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 14: Quantum Computation: Hardware Platforms I

FM 14.1: Invited Talk

Montag, 23. September 2019, 14:00–14:30, 3044

Quantum simulation and computation with spins in quantum dots — Uditendu Mukhopadhyay¹, Juan P Dehollain¹, Vincent P. Michal¹, Yao Wang², Bernhard Wunsch², Christian Reichl³, Werner Wegscheider³, Mark S. Rudner⁴, Eugene Demler², Lieven M. K. Vandersypen¹, and •Guoji Zheng¹ — ¹TU Delft — ²Harvard University — ³ETH Zürich — ⁴University of Copenhagen

Electrostatically defined quantum dots in semiconductors are one of the leading platforms for the development of quantum technologies, owing to their fast and efficient control and measurement, as well as their compatibility with industrial semiconductor fabrication. At the Vandersypen lab, we use the electrons confined in quantum dots to perform quantum simulation and computation.

In this talk, I will delve into some of our latest experiments. I will begin with a description of the types of quantum dot arrays that we operate, highlighting the techniques that we have developed recently to overcome the problem of disorder and efficient control, which is crucial to the operation and scale-up of these systems as quantum simulators and processors. I will then describe our latest quantum simulator device-a 2x2 plaquette of quantum dots in a GaAs heterostructure-which we use to demonstrate Nagaoka ferromagnetism, one of the well-known theories of ferromagnetism based on the Hubbard model, which had yet to be demonstrated experimentally. Finally, I will present the capabilities of our silicon-based 2-qubit quantum information processor, with an outlook on how this technology can be further developed towards a large-scale universal quantum computer.