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DY: Fachverband Dynamik und Statistische Physik

DY 9: Quantum Dynamics, Decoherence and Quantum Information

DY 9.5: Talk

Monday, March 27, 2023, 15:00–15:15, MOL 213

Performance of quantum registers in diamond in the presence of spin impurities — •Dominik Maile and Joachim Ankerhold — Institut 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 (see also [1]), we provide such an analysis for a small spin registers with up to four spins built out of NV and environmental constituents in presence of ensembles of interacting impurity spins. Adapting a cluster correlation expansion, we predict coherence properties as well as fidelities for GHZ- and Bell-gate operations. The influence of the volume density and the geometry of the spin-bath consisting of substitutional nitrogen atoms are also taken into account.

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