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QI: Fachverband Quanteninformation

QI 28: Surface Atom and Color Center Spin Qubits

QI 28.9: Talk

Thursday, March 21, 2024, 17:30–17:45, HFT-FT 131

Performance of quantum registers in diamond in the presence of spin impurities — •Dominik Maile and Joachim Ankerhold — Institute for Complex Quantum Systems, Ulm University

The Nitrogen Vacancy Center in diamond coupled to addressable surrounding nuclear spins forms a versatile building block for future quantum technologies. While previous activities focused on sensing with only a single or very few spins in operation, recently multi-qubit registers have been successfully implemented for quantum information processing. Further progress requires a detailed understanding of the performance of quantum protocols for consecutive gate operations and thus, beyond established treatments for relaxation and dephasing. In this talk, we provide such a theoretical analysis for a small spin registers with up to four spins built out of NV and environmental constituents in presence of ensembles of impurity spins. Thereby, we discuss the tradeoff between fast control of the full register and the leakage of entanglement to unwanted spins in the environment. We also show perspectives on how to overcome present limitations.

[1] D.Maile and J.Ankerhold, arXiv:2211.06234 (2023)

Keywords: NV-Centers in Diamond; Quantum Control; Open Quantum Systems; Decoherence