| Issue |
EPL
Volume 108, Number 5, December 2014
|
|
|---|---|---|
| Article Number | 54007 | |
| Number of page(s) | 6 | |
| Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
| DOI | https://doi.org/10.1209/0295-5075/108/54007 | |
| Published online | 16 December 2014 | |
Nonlinear parametric interaction and higher-order squeezing in coherent population trapping
1 College of Science, China Three Gorges University - Yichang, 443002, China
2 College of Physical Science and Technology, Central China Normal University - Wuhan, 430079, China
(a) feiwang202@163.com (corresponding author)
(b) xmhu@phy.ccnu.edu.cn (corresponding author)
Received: 16 July 2014
Accepted: 25 November 2014
In this paper, we show that coherent population trapping (CPT) system can act as a nonlinear parametric interaction process, in which higher-order nonlinear effects are included, giving rise to the occurrence of nonclassical quantum correlation. Furthermore, our numerical results confirm that single- and two-mode higher-order squeezing are possible to obtain under different conditions because of the higher-order nonlinear effects, which are strongly determined by the atomic coherence. The higher-order squeezing obtained in CPT is robust against dissipation since the atoms are nearly trapped into the ground state, which may be useful for high-precision measurement.
PACS: 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption / 32.80.Qk – Coherent control of atomic interactions with photons / 42.50.Lc – Quantum fluctuations, quantum noise, and quantum jumps
© EPLA, 2014
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