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A possibility of the electronic origin of the high-temperaturesuperconductivity in cuprates is probed with the quantum Monte Carlo method byrevisiting the three-band Hubbard model comprising Cu$3d_{x^2-y^2}$ andO$2p_\sigma$ orbitals. The $d_{x^2-y^2}$ pairing correlation is found to turninto an increasing function of the repulsion $U_d$ within the $d$ orbitals orthe $d$-$p$ level off-set $\Delta \varepsilon$, where the correlation growswith the system size. % and is long-ranged as also seen from a real-spaceanalysis. We have detected this in both the charge-transfer and Mott-Hubbardregimes upon entering the strong-correlation region ($U_d$ or $\Delta\varepsilon >$ bare band width).Comment: 8 pages, revtex, 5 figures available on request from  kuroki@izanagi.phys.s.u-tokyo.ac.jp , replaced because we have added  reference [4] (R.T. Scalettar et.al. Phys. Rev. B 44, 770 (1991)) in our  manuscrip

Quantum Monte Carlo Evidence for Superconductivity in the Three-Band Hubbard Model in Two Dimensions