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Optik

Higher order squeezing as a measure of nonclassicality

Muhammad Ashfaq Ahmad, Sehrish Azam, Samia Aslam, Syed Hamad Bukhari, Ayesha Jamil, Faiza Mustafa, Salman Naeem Khan

Published Dec 23, 2015• 2 citations
Publisher
DOI
10.1016/j.ijleo.2015.11.228

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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.