Phys. Rev. Lett. 101, 073601 (2008) [4 pages]Spin Squeezing of Atomic Ensembles via Nuclear-Electronic Spin Entanglement
See accompanying Physics Synopsis We demonstrate spin squeezing in a room temperature ensemble of ≈1012 cesium atoms using their internal structure, where the necessary entanglement is created between nuclear and electronic spins of each individual atom. This state provides improvement in measurement sensitivity beyond the standard quantum limit for quantum memory experiments and applications in quantum metrology and is thus a complementary alternative to spin squeezing obtained via interatom entanglement. Squeezing of the collective spin is verified by quantum state tomography. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.073601
DOI:
10.1103/PhysRevLett.101.073601
PACS:
42.50.Dv, 03.65.Wj, 03.67.Hk, 42.50.Lc
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