Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Color Centers III
Q 43.1: Talk
Thursday, March 14, 2024, 11:00–11:15, Aula
Long-lived quantum network memories using spin qubits in isotopically engineered diamond — •Kai-Niklas Schymik1, Benjamin van Ommen1, Conor Bradley2, Takashi Yamamoto1, and Tim Hugo Taminiau1 — 1QuTech an Kavli Institute of Nanoscience Delft, Delft University of Technology, 2628 CJ Delft, The Netherlands — 2Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA
Optically active spin qubits in solid-state materials, such as the NV center in diamond, are a promising platform for quantum computation distributed over a network. To increase the size and circuit depth of such a quantum network, e.g. beyond the state-of-the-art of three nodes, long-lived quantum memories in each node are desired. Recent work has identified Carbon-13 spin qubits in isotopically purified diamond as a promising candidate. In this work, we demonstrate control over isotope concentration in (111) CVD-grown diamond. At the targeted concentration of 0.05%, we show that memory qubits with kHz couplings can be addressed and measure long coherence times of the spin qubits. With a memory decoherence rate lower than possible entanglement rates between remote NV centers, these devices show promise for distributed computations using more than one entangled Bell pair.
Keywords: Quantum Networks; Quantum Memory; NV Center; Spin Qubits