Print Email Facebook Twitter Coherent spin-exchange via a quantum mediator Title Coherent spin-exchange via a quantum mediator Author Baart, T.A. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Fujita, T. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Reichl, Christian (ETH Zürich) Wegscheider, Werner (ETH Zürich) Vandersypen, L.M.K. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Date 2017-01-10 Abstract Coherent interactions at a distance provide a powerful tool for quantum simulation and computation. The most common approach to realize an effective long-distance coupling on-chip' is to use a quantum mediator, as has been demonstrated for superconducting qubits and trapped ions. For quantum dot arrays, which combine a high degree of tunability with extremely long coherence times, the experimental demonstration of the time evolution of coherent spin-spin coupling via an intermediary system remains an important outstanding goal. Here, we use a linear triple-quantum-dot array to demonstrate a coherent time evolution of two interacting distant spins via a quantum mediator. The two outer dots are occupied with a single electron spin each, and the spins experience a superexchange interaction through the empty middle dot, which acts as mediator. Using single-shot spin readout, we measure the coherent time evolution of the spin states on the outer dots and observe a characteristic dependence of the exchange frequency as a function of the detuning between the middle and outer dots. This approach may provide a new route for scaling up spin qubit circuits using quantum dots, and aid in the simulation of materials and molecules with non-nearest-neighbour couplings such as MnO (ref. 27), high-temperature superconductors and DNA. The same superexchange concept can also be applied in cold atom experiments. To reference this document use: http://resolver.tudelft.nl/uuid:95712fc6-9fc1-4b3b-bed3-f665f72e5150 DOI https://doi.org/10.1038/nnano.2016.188 Embargo date 2017-07-10 ISSN 1748-3387 Source Nature Nanotechnology, 12 (1), 26-30 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2017 T.A. Baart, T. Fujita, Christian Reichl, Werner Wegscheider, L.M.K. Vandersypen Files PDF final_resubmission_22563_ ... 630642.pdf 14.06 MB Close viewer /islandora/object/uuid:95712fc6-9fc1-4b3b-bed3-f665f72e5150/datastream/OBJ/view