期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.010509
关键词
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资金
- Hong Kong Research Grants Council [16304817]
- William Mong Institute of Nano Science and Technology [WMINST19SC05]
- National Key Research and Development Program of China [2016YFA0302800, 2016YFA0301803]
- National Natural Science Foundation of China [61378012, 91636218, 11822403, 11804104, 11804105, 61875060, U1801661]
- Key-Area Research and Development Program of Guangdong Province [2019B030330001]
- Natural Science Foundation of Guangdong Province [2015TQ01X715, 2014A030306012, 2018A030313342, 2018A0303130066]
- Key Project of Science and Technology of Guangzhou [201804020055]
We report the direct characterization of energy-time entanglement of narrow-band biphotons produced from spontaneous four-wave mixing in cold atoms. The Stokes and anti-Stokes two-photon temporal correlation is measured by single-photon counters with nanosecond temporal resolution, and their joint spectrum is determined by using a narrow linewidth optical cavity. The energy-time entanglement is verified by the joint frequency-time uncertainty product of 0.063 +/- 0.0044, which does not only violate the separability criterion but also satisfies the continuous variable Einstein-Podolsky-Rosen steering inequality.
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