Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 48: Poster – Quantum Optics, Technologies, and Optomechanics
Q 48.7: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Identifying error sources of dipole-dipole coupling mediated two-qubit gates between NV-centers in diamond — •Florian Ferlemann1,3, Timo Joas2, Roberto Sailer2, Philipp Vetter2, Genko Genov2, Fedor Jelezko2,4, Ressa Said2, Tommaso Calarco1,3,5, and Matthias Müller1 — 1Peter Grünberg Institute - Quantum Control (PGI-8), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany — 2Institute for Quantum Optics, Ulm University, 89081 Ulm, Germany — 3Institute for Theoretical Physics, University of Cologne, 50937 Köln, Germany — 4Center for Integrated Quantum Science and Technology (IQST), Ulm University, 89081 Ulm, Germany — 5Dipartimento di Fisica e Astronomia, Università di Bologna, 40127 Bologna, Italy
To create a large spin register in diamond realizing a good entangling gate between NV centers can be crucial. Even though entanglement between a pair of NV centers has been observed, high two qubit gate fidelities have not yet been demonstrated. We investigate at which conditions the latter can be realized with a pair of NV centers at room temperature, taking into account that their axes are misaligned and the nuclear spins are non-initialized. We analyze the behavior of the gate errors under different Rabi frequencies and identify the error sources that limit the single-qubit and two-qubit gate fidelities, where we explicitly study the influence of the nitrogen nuclear spins on the two-qubit gates under dynamical decoupling sequences. In this context we demonstrate high two-qubit gate fidelities.
Keywords: Nitrogen-vacancy centers; Entanglement; Electron spin qubits; Color centers in diamond; Error mitigation