Optically active spins in solid state materials are an important candidate for quantum communication and distributed quantum computation over a network. To increase the size of quantum networks, long-lived quantum memories in a network node and high-fidelity control of qubits in the network nodes are desired.
We discuss how isotopically engineered diamond can offer long-lived nuclear spin qubits that are robust to the optical link operation of the NV center. Furthermore, we use gate set tomography to report single-qubit and two-qubit gate fidelities exceeding 99.9% for the electron and nitrogen-nuclear spin of an NV center diamond.
Nuclear spins in diamond are promising for their use as qubits in quantum computers and quantum networks, and for simulating many-body physics phenomena. Building on recent results [1,2], we combine precise knowledge of the nuclear spin environment with dynamic nuclear polarization techniques and selective readout protocols to extend control over more nuclear spin qubits within a large interacting cluster. These techniques open the door to the quantum simulation of complex many-body physics phenomena using nuclear spins in diamond. [1] – M. H. Abobeih et al. Nature, 576, 411–415 (2019) [2] – C. E. Bradley et al. Phys. Rev. X 9, 031045 (2019).
KEYWORDS: Antennas, Gold, Spectroscopy, Near field scanning optical microscopy, Metals, Imaging spectroscopy, Near field optics, Microscopy, Luminescence, Electromagnetism
Two-photon induced photoluminescence (TPL) microscopy has been used to probe the local field of nanoantennas.
We demonstrate that TPL imaging is directly correlated to the antenna electromagnetic mode computed
with a full 3D solver. Furthermore, spectroscopic mode mapping while scanning the incident wavelength enables near-field spectroscopy of specific areas of the antenna response, providing a deeper insight into its
resonant properties.
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