Ion beams mean a quantum leap for color-center qubits

Phys.org   April 28, 2021 An international team of researchers (USA – Lawrence Berkeley National Laboratory, Finland, Singapore, Germany) has measured depth-resolved photoluminescence of nitrogen-vacancy (NV−) centers formed along the tracks of swift heavy ions (SHIs) in synthetic single crystal diamonds that had been doped with nitrogen during crystal growth. Analysis of the spectra showed that NV− centers are formed preferentially within regions where electronic stopping processes dominate and not at the end of the ion range where elastic collisions lead to the formation of vacancies and defects. Thermal annealing further increased NV yields after irradiation with SHIs preferentially in regions […]

Quantum on the edge: Light shines on new pathway for quantum technology (w/video)

Phys.org  November 1, 2018 To unleash the potential of quantum technology, scientists need to find a way to protect the entangled superposition of qubits at the nanoscale. An international team of researchers (Australia, Israel) developed a novel lattice structure of silicon nanowires, creating a particular symmetry that provides unusual robustness to the photons’ correlation. Robustness stems from the underlying topology. Waveguides made using silicon nanowires were lined up in pairs with a deliberate defect in symmetry through the middle, creating two lattice structures with different topologies and an intervening ‘edge’. This topology allows for the creation of special modes in […]