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To establish an applicable system for advanced quantum information processingbetween light and atoms, we have demonstrated the quantum non-demolition (QND)measurement with a collective spin of cold ytterbium atoms (171Yb), andobserved 1.8 (-1.5, +2.4) dB spin squeezing. Since a 171Yb atom has only anuclear spin of 1/2 in the ground state, the system is the simplest spinensemble and robust against decoherence. We used very short pulses with thewidth of 100 ns, so the interaction time became much shorter than thedecoherence time, which is important for multi-step quantum informationprocessing.

Spin squeezing of a cold atomic ensemble with the nuclear spin of one-half