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Background Imaging of Cosmic Extragalactic Polarization (BICEP) is abolometric polarimeter designed to measure the inflationary B-mode polarizationof the cosmic microwave background (CMB) at degree angular scales. During threeseasons of observing at the South Pole (2006 through 2008), BICEP mapped ~2% ofthe sky chosen to be uniquely clean of polarized foreground emission. Here wepresent initial results derived from a subset of the data acquired during thefirst two years. We present maps of temperature, Stokes Q and U, E and B modes,and associated angular power spectra. We demonstrate that the polarization dataare self-consistent by performing a series of jackknife tests. We studypotential systematic errors in detail and show that they are sub-dominant tothe statistical errors. We measure the E-mode angular power spectrum with highprecision at 21 < ell < 335, detecting for the first time the peak expected atell ~ 140. The measured E-mode spectrum is consistent with expectations from aLCDM model, and the B-mode spectrum is consistent with zero. Thetensor-to-scalar ratio derived from the B-mode spectrum is r = 0.03+0.31-0.26,or r < 0.72 at 95% confidence, the first meaningful constraint on theinflationary gravitational wave background to come directly from CMB B-modepolarization.

Measurement of Cosmic Microwave Background Polarization Power Spectra from Two Years of BICEP Data