Diamonds in a new light: creating optical interfaces for single color centers | Dr. Christoph Becher (Saarland University, Saarbrücken, Germany)

Empieza el Septiembre 06, 2017 16:00

En Campus San Joaquín, Facultad de Física

Categorías: Coloquios

Diamonds in a new light: creating optical interfaces for single color centers

Photonics is the science of generation, manipulation and detection of light for applications in transmission, storage and processing of information.
In recent years, this field has been extended by concepts and methods employing the laws of quantum physics, enabling the realization of novel approaches like quantum computing and quantum communication. In this context, the notions of transmission, storage and processing of quantum information using optical methods are commonly named quantum photonics. Color centers in diamond, i.e. atomic-scale, optically active defects
in the diamond lattice, have received large recent attention as versatile tools for solid-state-based quantum technologies ranging from quantum information processing to quantum-enhanced sensing and metrology. They provide individually addressable spins with very long coherence times, narrow optical spectra and bright single-photon emission. A remaining issue is the creation of quantum photonic interfaces by coupling of single
color centers in diamond to photons, providing efficient spin-readout and enabling integrated solid-state devices for quantum information processing and quantum sensing. For efficient interfacing of single nitrogen-(NV) or silicon-vacancy (SiV) color centers in diamond to photons I will present several routes:
(i) deterministic coupling to optical cavities at the micro- and nano-scale using fiber-based,
tunable, Fabry-Perot-type resonators or photonic crystal cavities directly fabricated in the diamond material;
(ii) increasing photon collection efficiencies by nanophotonic waveguiding structures such, e.g. nanowires or by
(iii) control of the local density of states (LDOS), e.g. planar antenna structures, consisting of layers of dielectric and metal films, which modify the dipole emission characteristics."