Iwasawa, Kohjiro; Makino, Kenzo; Yonezawa, Hidehiro; Tsang, Mankei; Davidovic, A; Huntington, Elanor Harriet; Furusawa, Akira
We experimentally demonstrate optomechanical motion and force measurements near the quantum precision limits set by the quantum Cramér-Rao bounds. Optical beams in coherent and phase-squeezed states are used to measure the motion of a mirror under an external stochastic force. Utilizing optical phase tracking and quantum smoothing techniques, we achieve position, momentum, and force estimation accuracies close to the quantum Cramér-Rao bounds with the coherent state, while the estimation using...[Show more]
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