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Precise control of hyperfine matterwaves via Raman excitations isinstrumental to a class of atom-based quantum technology. We investigate theRaman spinor control technique for alkaline atoms in an intermediate regime ofsingle-photon detuning where a choice can be made to balance the Ramanexcitation power efficiency with the control speed, excited-state adiabaticelimination, and spontaneous emission suppression requirements. Within theregime, rotations of atomic spinors by the Raman coupling are biased bysubstantial light shifts. Taking advantage of the fixed bias angle, we showthat composite biased rotations can be optimized to enable precise ensemblespinor matterwave control within nanoseconds, even for multiple Zeemanpseudo-spins defined on the hyperfine ground states and when the laserillumination is strongly inhomogeneous. Our scheme fills a technical gap inlight pulse atom interferometry, for achieving high speed Raman spinormatterwave control with moderate laser power.

Composite Biased Rotations for Precise Raman Control of Spinor Matterwaves