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We demonstrate unconditional quantum-noise suppression in a collective spinsystem via feedback control based on quantum non-demolition measurement (QNDM).We perform shot-noise limited collective spin measurements on an ensemble of$3.7\times 10^5$ laser-cooled 171Yb atoms in their spin-1/2 ground states.Correlation between two sequential QNDMs indicates$-0.80^{+0.11}_{-0.12}\,\mathrm{dB}$ quantum noise suppression in a conditionalmanner. Our feedback control successfully converts the conditionalquantum-noise suppression into the unconditional one without significant lossof the noise

Unconditional quantum-noise suppression via measurement-based quantum feedback