In this paper we present our recent developments in control and manipulation of individual spins and photons in a single
nanowire quantum dot. Specific examples include demonstration of optical excitation of single spin states, charge
tunable quantum devices and single photon sources. We will also discuss our recent discovery of a new type of charge
confinement - crystal phase quantum dots. They are formed from the same material with different crystal structure, and
today can only be realized in nanowires.
The catalyst-assisted growth of semiconductor nanowires heterostructures offers a very flexible way to design and
fabricate single photon emitters. The nanowires can be positioned by organizing the catalyst prior to growth. Single
quantum dots can be formed in the core of single nanowires which can then be easily isolated and addressed to generate
single photons. Diameter and height of the dots can be controlled and their emission wavelength can be tuned at the
optical telecommunication wavelengths by the material composition. The final morphology of a wire can be shaped by
the radial/axial growth ratio, offering the possibility to form single mode optical waveguides with a tapered end for
efficient photon collection.