Search for B-modes in CMB polarization with Multi-Frequency Observation

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B-modes, faint polarization pattern in Cosmic Microwave Background (CMB) is smoking gun signature of inflationary universe. We searched B-modes with QUIET experiment which is ground-based CMB polarization telescope. Based on 40GHz band data, we obtained the second best upper limits for B-modes. We also have evidence for foreground (Galaxy emission) contamination in one of our four observation fields. Understanding of the foreground contamination is the important in future. Since we already have 90GHz band observation data in addition to the 40GHz band data, we have prospects to obtain the world best B-modes limits with combined results for both bands.