Ponderomotive squeezing and entanglement in a ring cavity with two vibrational mirrors*
Feng Xiao-Min, Yin Xiao, Yu Ya-Fei, Zhang Zhi-Ming†
       
A ring cavity with four mirrors. A laser beam enters into the ring cavity through the fixed partially transmitting mirror F1. The fixed mirror F2 and the two vibrational mirrors (M1 and M2) are perfectly reflecting.