  We report on recent technical developments in the front- and back-ends for
the four 20 m radio telescopes of the Japanese Very-Long-Baseline
Interferometry (VLBI) project, VLBI Exploration of Radio Astrometry (VERA). We
present a brief overview of a dual-circular polarization receiving and
ultrawideband (16 Giga bit s$^{-1}$) recording systems that were installed on
each of the four telescopes operating at 22 and 43 GHz bands. The wider-band
capability improves the sensitivity of VLBI observations for continuum
emission, and the dual-polarization capability enables the study of magnetic
fields in relativistic jets ejected from supermassive black holes in active
galactic nuclei and in sites of star formation and around evolved stars. We
present the linear polarization intensity maps of extragalactic sources at 22
and 43 GHz obtained from the most recent test observations to show the state of
the art of the VERA polarimetric observations. At the end of this article,
given the realization of VLBI polarimetry with VERA, we describe the future
prospects for scientific aims and further technical developments.
