https://doi.org/10.1140/epjd/e2007-00199-0
Non-classical correlation of the two emission fields by a four-level atomic ensemble
1
Department of Physics, Hong Kong Baptist University, Hong Kong, P.R. China
2
Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, P.R. China
Corresponding author: a hjhxyx@yahoo.com.cn
Received:
7
November
2006
Revised:
1
April
2007
Published online:
20
June
2007
The normalized second-order correlation of the emission fields from a driven four-level atomic ensemble is investigated theoretically by using the state vector method. The violation of Cauchy-Schwarz inequality, which indicates the establishment of non-classical correlation between two emission fields, has been found. The effects of various decays and time delay on the correlation are discussed in detail, which are helpful in finding the ways to obtain high non-classical correlation. This technique for the generation of non-classical light is operable based on the current experimental technology and will lead to some potential applications in quantum information science.
PACS: 32.80.Qk – Coherent control of atomic interactions with photons / 03.67.Mn – Entanglement production, characterization, and manipulation / 42.50.Fx – Cooperative phenomena in quantum optical systems
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007
