期刊
PHYSICAL REVIEW LETTERS
卷 101, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.073601
关键词
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资金
- EU [FP6-015848 (QAP), FP6-511004 (COVAQIAL)]
- Engineering and Physical Sciences Research Council [EP/E036473/1] Funding Source: researchfish
- EPSRC [EP/E036473/1] Funding Source: UKRI
We demonstrate spin squeezing in a room temperature ensemble of approximate to 10(12) 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.
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