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TT: Fachverband Tiefe Temperaturen

TT 31: Topology: Majorana Physics

TT 31.6: Talk

Wednesday, March 29, 2023, 10:45–11:00, HSZ 304

Tunable coupling of quantum dots via Andreev bound states - towards a Kitaev chain — Chun-Xiao Liu, Guanzhong Wang, Tom Dvir, and •Michael Wimmer — Qutech and Kavli Institute for nanophysics, TU Delft, Niederlande

We show that the coupling between two quantum dots can be effectively mediated via Andreev bound states in a central superconducting segment. This gives rise to an effective superconducting and normal coupling between quantum dot states. Both coupling strengths can be independently controlled by changing the properties of the Andreev bound states, e.g. by a gate voltage. This allows to implement a Kitaev chain that can easily be tuned to a topological phase [1]. We will also discuss first experimental results implementing a two-site Kitaev chain [2, 3].
[1] arXiv:2203.00107
[2] arXiv:2205.03458
[3] arXiv:2206.08045