Abstract: Improved spin-microwave coupling is provided using a microwave cavity having a galvanic element connecting two points on its walls. This configuration can provide an unusual cavity mode having a highly concentrated magnetic field (to provide good coupling to a spin system) and a spread-out electric field (to reduce loss, since the electric field is almost entirely in vacuum). The galvanic element preferably includes a nano-scale current concentration feature (i.e., sub 100 nm lateral dimensions) to concentrate the magnetic field. The spin system of interest is preferably disposed in proximity to this current concentration feature. Applications include coherent quantum optical-microwave transduction and quantum memories.

Abstract: This disclosure relates to optical devices for quantum information processing applications. In one example implementation, a semiconductor structure is provided. The semiconductor structure may be embedded with single defects that can be individually addressed. An electric bias and/or one or more optical excitations may be configured to control the single defects in the semiconductor structure to produce single photons for use in quantum information processing. The electric bias and optical excitations are selected and adjusted to control various carrier processes and to reduce environmental charge instability of the single defects to achieve optical emission with wide wavelength tunability and narrow spectral linewidth. Electrically controlled single photon source and other electro-optical devices may be achieved.

Abstract: A wind sensor device consisting of a plurality of light weight, flexible, high tensile strength filaments attached to and depending from a malleable elongated body structure, such as a wire. The filaments are blown by the wind, thus indicating direction. The flexible body structure is used to attached the device to a hunter's rifle, gun, bow, tree, or other nearby object such as a branch, thus freeing the hunter's hands for other tasks.