TY - JOUR
T1 - Quantum-limited mirror-motion estimation
AU - Iwasawa, Kohjiro
AU - Makino, Kenzo
AU - Yonezawa, Hidehiro
AU - Tsang, Mankei
AU - Davidovic, Aleksandar
AU - Huntington, Elanor
AU - Furusawa, Akira
PY - 2013/10/18
Y1 - 2013/10/18
N2 - 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 squeezed states shows clear quantum enhancements beyond the coherent-state bounds.
AB - 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 squeezed states shows clear quantum enhancements beyond the coherent-state bounds.
UR - http://www.scopus.com/inward/record.url?scp=84886263472&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.111.163602
DO - 10.1103/PhysRevLett.111.163602
M3 - Article
SN - 0031-9007
VL - 111
JO - Physical Review Letters
JF - Physical Review Letters
IS - 16
M1 - 163602
ER -