Quantum feedback cooling of two trapped ions
Zhang Shuo1, 3, Wu Wei2, †, Wu Chun-Wang2, ‡, Li Feng-Guang1, Li Tan1, Wang Xiang1, Bao Wan-Su1
       

(color online) R as a function of G1 and G2 for (a) , (b) , and (c) . The other parameters are , , , and .