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Chin. Phys. B, 2013, Vol. 22(10): 100308    DOI: 10.1088/1674-1056/22/10/100308
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Generation of steady four-atom decoherence-free states via quantum-jump-based feedback

Wu Qi-Cheng (吴奇成), Ji Xin (计新)
Department of Physics, College of Science, Yanbian University, Yanji 133002, China
Abstract  A scheme is presented for generating steady four-atom decoherence-free states via four atoms with the Raman level configuration interacting with a single-mode vacuum cavity field by using quantum-jump-based feedback. The scheme meets the condition of a strongly dissipative cavity easily and has a simplified feedback control. Although the spontaneous emission still plays a negative role in the proposed system, we can improve the feedback control to reduce its effect.
Keywords:  Raman three-level atom      large detuning      four-atom decoherence-free state      quantum-jump-based feedback  
Received:  28 February 2013      Revised:  10 April 2013      Accepted manuscript online: 
PACS:  03.67.Bg (Entanglement production and manipulation)  
  03.65.Yz (Decoherence; open systems; quantum statistical methods)  
  42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)  
  42.50.Pq (Cavity quantum electrodynamics; micromasers)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11064016 and 61068001).
Corresponding Authors:  Ji Xin     E-mail:

Cite this article: 

Wu Qi-Cheng (吴奇成), Ji Xin (计新) Generation of steady four-atom decoherence-free states via quantum-jump-based feedback 2013 Chin. Phys. B 22 100308

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