Electromagnetically induced squeezing of atomic spin

Abstract

We present a special quantum effect named electromagnetically induced squeezing of atomic spin in the conventional Λ-type atomic system driven by a strong pump field and a relatively weak probe field in an atomic ensemble. Nearly perfect atomic spin squeezing in the y component can be achieved with fully on resonance at high pump-field intensity, large optical depth of the atomic ensemble, and a low coherence decay rate between the two lower levels. This method would greatly facilitate the generation of atomic spin squeezing by using only coherent laser fields, and may find potential applications in realistic quantum metrology, quantum computation, and quantum information processing.

KEYWORDS:

• Electromagnetically induced squeezing
• atomic spin
• electromagnetically induced transparency

Acknowledgements

X. Yang wishes to thank Shengwang Du at HKUST for helpful discussion of the manuscript during his visit to Hong Kong. This work is supported by National Natural Science Foundation of China (Nos. 11574195 and 11274225), Innovation Action Plan of International Academic Cooperation and Exchange Program of Shanghai Municipal Science and Technology Commission (No. 16520720800). Yang’s e-mail is [email protected] or [email protected].

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

X. Yang wishes to thank Shengwang Du at HKUST for helpful discussion of the manuscript during his visit to Hong Kong. This work is supported by National Natural Science Foundation of China (Nos. 11574195 and 11274225), Innovation Action Plan of International Academic Cooperation and Exchange Program of Shanghai Municipal Science and Technology Commission (No. 16520720800).