Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.163602
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Funding
- JSPS [18204035, 21102005C01]
- GCOE Program The Next Generation of Physics, Spun from Universality and Emergence from MEXT of Japan
- World-Leading Innovative R&D on Science and Technology (FIRST)
- Grants-in-Aid for Scientific Research [22244050, 21102005, 23654086, 23840024] Funding Source: KAKEN
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We demonstrate unconditional quantum-noise suppression in a collective spin system via feedback control based on quantum nondemolition measurement. We perform shot-noise limited collective spin measurements on an ensemble of 3.7 X 10(5) laser-cooled Yb-171 atoms in their spin-1/2 ground states. Correlation between two sequential quantum nondemolition measurements indicates -0.80(-0.12)(+0.11) dB quantum-noise suppression in a conditional manner. Our feedback control successfully converts the conditional quantum-noise suppression into the unconditional one without significant loss of the noise reduction level. DOI: 10.1103/PhysRevLett.110.163602
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