Squeezing more from a quantum nondemolition measurement
B. C. Buchler, Ping Koy Lam, Hans‐A. Bachor, Ulrik L. Andersen, Timothy C. Ralph · Physical Review A · 2001
We use a stable, 5 dB, amplitude squeezed source for a quantum nondemolition (QND) experiment. The performance of our QND system is enhanced by an electro-optic feedforward loop which improves the signal transfer efficiency. At best, we measure a total signal transfer of 1.81 and conditional variance of 0.55.