The recent measurements of the cosmic microwave background (CMB) polarization started to
open the new window to probe the signature of inflation and the large-scale structure
using the B-mode polarization. The measurements of the CMB polarization can be used to
probe beyond the standard Big Bang cosmology. The recent results from the ground based
CMB polarization experiment, POLARBEAR, disclose the first data points on the B-mode
power spectrum from the large scale structure of the Universe via gravitational lensing
effect. Also another ground based CMB polarization experiment, BICEP-2, announced the
detection of the inflationary B-mode polarization signal. 

In this talk I will introduce the overview of the observational cosmology using the CMB
polarization and highlight some of the experimental techniques. I will also introduce
the recent developments in the CMB polarization experiments from POLARBEAR and BICEP-2,
and discuss their cosmological implications. Finally, we discuss the ongoing activities
of a next generation CMB polarization satellite, LiteBIRD.