Dissipative preparation of three-atom entanglement state via quantum feedback control
Wen-Mei Sun, Shi‐Lei Su, Zhao Jin, Yan Liang, Ai‐Dong Zhu, Hong‐Fu Wang, Shou Zhang · Journal of the Optical Society of America B · 2015
Two schemes are presented for generating steady three-atom Greenberger–Horne–Zeilinger and W states in a strongly dissipative cavity via quantum feedback control. The quantum feedback control is only applied to a single atom based on quantum-jump detection to improve the fidelity of the target state. Thus, cavity decay plays a key role in obtaining the target state. The required interaction time need not be accurately controlled.