Print Email Facebook Twitter Gate Set Tomography on the Nitrogen-Vacancy Center Title Gate Set Tomography on the Nitrogen-Vacancy Center Author Polshchykova, Zoya (TU Delft Electrical Engineering, Mathematics and Computer Science; TU Delft Applied Sciences) Contributor Borregaard, J. (mentor) de Laat, D. (mentor) Greplová, E. (graduation committee) Möller, M. (graduation committee) Degree granting institution Delft University of Technology Programme Applied Mathematics | Applied Physics Date 2022-09-06 Abstract In this thesis, gate set tomography (GST) has been conducted on the nitrogen vacancy center (NV). Gate set tomography is a protocol for characterization of logic operations (gates) on quantum computing processors. The NV’s electron served as a qubit. The quantum circuits were run both experimentally as well as on an NV-simulator. GST is different from its predecessors in the sense that it estimates all aspects of the processor simultaneously, without assuming any of its parts to be ideal. However, it does assume that the gates are Markovian. This allows to analyse the gate errors more precisely via their error generators. In addition to this, the diamond norm and a measure of the amount of model violation were used to examine the results. The electron qubit can couple to the nearby nitrogen nucleus, which can cause non-Markovian dynamics. The nitrogen nucleus (𝑆 = 1) can be initialised using nuclear spin polarization. The effects of different initialisation procedures on GST’s results wereresearched. Furthermore, a dynamical decoupling XY-4 echo sequence could be employed to protect the quantum state of the qubit. How the presence of the echo affected the estimated gates and their errors was probed. It was discovered that the echo was extremely good at decreasing the amount of model violation, most likely by preventing the electron from coupling to the nitrogen, which can lead to non-Markovian dynamics. Without the echo, GST’s estimates were satisfactory only if the nitrogen nucleus was initialised with a high enough fidelity, at least 0.95. Another topic for further research would be to perform GST on the electron and the nitrogen system, by modelling the nitrogen nucleus asa qutrit. Subject Gate set tomographyNitrogen-vacancy centerMarkovianityXY-4 sequence To reference this document use: http://resolver.tudelft.nl/uuid:d3e124e9-36f7-4cf7-817e-e0625ada3421 Part of collection Student theses Document type bachelor thesis Rights © 2022 Zoya Polshchykova Files PDF Zoya_Polshchykova_BEP.pdf 4.16 MB Close viewer /islandora/object/uuid:d3e124e9-36f7-4cf7-817e-e0625ada3421/datastream/OBJ/view