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QI: Fachverband Quanteninformation

QI 11: Semiconductor Spin Qubits II: Si, Ge, and Color Centers

QI 11.6: Vortrag

Dienstag, 11. März 2025, 12:30–12:45, HS II

Entangling high nuclear spin memory qudits via electron spin communication qubits — •Wolf-Rüdiger Hannes and Guido Burkard — Department of Physics, University of Konstanz, 78457 Konstanz, Germany

Solid-state defects with optically addressable electron spin and long-lived nuclear spin hold promise for use as quantum network nodes. Of particular interest are nuclear isotopes with high spin quantum number I, which could be exploited in efficient error-correction [1] or high-dimensional one-way quantum processing [2]. Here we demonstrate a scheme to maximally entangle d=2I+1-dimensional memory qudits in separate nodes by repeated entanglement transfer from the electron spin qubits, each time prepared in two-qubit cluster states. The transfer uses a controlled-phase like gate mediated by the hyperfine coupling, and higher nuclear spins further require broad radio-frequency driving. Depending on I, this results in a nearly perfect scheme or it can be further improved by varying the coupling, e.g., through the use of alternating rotating frames or occupying different pairs of electron levels in the case of spin triplets.
[1] J. A. Gross, Phys. Rev. Lett. 127, 10504 (2021).
[2] C. Reimer et al., Nature Physics 15, 148 (2019).

Keywords: Color centers; Qudits; Cluster states