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We demonstrated for the first time the production of highly polarizedshort-pulse positrons with a finite energy spread in accordance with a newscheme that consists of two-quantum processes, such as inverse Comptonscatterings and electron-positron pair creations. Using a circularly polarizedlaser beam of 532 nm scattered off a high-quality electron beam with the energyof 1.28 GeV, we obtained polarized positrons with an intensity of 10^4e+/bunch. Magnitude of positron polarizations was determined as 73+-15(sta)+-19(sys)% by means of a newly designed positron polarimeter.Comment: 9 pages, 6 figure

Efficient Propagation of Polarization from Laser Photons to Positrons through Compton Scattering and Electron-Positron Pair Creation