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The Zeeman hyperfine state dependent force in a Stern-Gerlach (SG) experimenthas been exploited to separate and detect atoms having different Zeemanhyperfine states in a cold atom cloud. Utilizing this SG technique, we havemade the quantitative estimate of atoms in different Zeeman hyperfine states inan atom cloud, which has been helpful in optimizing the optical pumping ofatoms for efficient preparation of atomic state. Employing an optimized opticalpumping, nearly $92 \% $ of cold $^{87}Rb$ atoms from a grey magneto-opticaltrap (G-MOT) on atom-chip have been optically pumped to the trappable Zeemanhyperfine state $\ket{F=2, \, m_{F} = +2}$. These optically pumped atoms havebeen trapped in an Ioffe-Pritchard magnetic trap near the atom-chip surface.

Efficient quantum state preparation using Stern-Gerlach effect on cold atoms