000266791 001__ 266791
000266791 005__ 20190625154533.0
000266791 022__ $$a2041-1723
000266791 02470 $$a000467133600003$$2isi
000266791 0247_ $$a10.1038/s41467-019-10024-3$$2doi
000266791 037__ $$aARTICLE
000266791 245__ $$aOptical backaction-evading measurement of a mechanical oscillator
000266791 260__ $$c2019$$aLondon$$bNATURE PUBLISHING GROUP
000266791 269__ $$a2019-05-07
000266791 336__ $$aJournal Articles
000266791 520__ $$aQuantum mechanics imposes a limit on the precision of a continuous position measurement of a harmonic oscillator, due to backaction arising from quantum fluctuations in the measurement field. This standard quantum limit can be surpassed by monitoring only one of the two non-commuting quadratures of the motion, known as backaction-evading measurement. This technique has not been implemented using optical interferometers to date. Here we demonstrate, in a cavity optomechanical system operating in the optical domain, a continuous two-tone backaction-evading measurement of a localized gigahertz-frequency mechanical mode of a photonic-crystal nanobeam cryogenically and optomechanically cooled close to the ground state. Employing quantum-limited optical heterodyne detection, we explicitly show the transition from conventional to backaction-evading measurement. We observe up to 0.67 dB (14%) reduction of total measurement noise, thereby demonstrating the viability of backaction-evading measurements in nanomechanical resonators for optical ultrasensitive measurements of motion and force.
000266791 650__ $$aMultidisciplinary Sciences
000266791 650__ $$aScience & Technology - Other Topics
000266791 6531_ $$aquantum limits
000266791 6531_ $$amotion
000266791 6531_ $$afluctuations
000266791 6531_ $$aentanglement
000266791 6531_ $$aphonons
000266791 6531_ $$aforce
000266791 6531_ $$anoise
000266791 700__ $$aShomroni, Itay$$0249064$$g256157
000266791 700__ $$aQiu, Liu$$0248141$$g236061
000266791 700__ $$aMalz, Daniel
000266791 700__ $$aNunnenkamp, Andreas
000266791 700__ $$aKippenberg, Tobias J.$$0244694$$g182444
000266791 773__ $$q2086$$j10$$tNature Communications
000266791 8560_ $$fmohammad.bereyhi@epfl.ch
000266791 909C0 $$yApproved$$pLPQM$$xU11831$$mmohammad.bereyhi@epfl.ch$$zPasquier, Simon$$0252348
000266791 909CO $$particle$$ooai:infoscience.epfl.ch:266791$$pSTI$$pSB
000266791 961__ $$avalerie.charbonnier@epfl.ch
000266791 973__ $$aEPFL$$sPUBLISHED$$rREVIEWED
000266791 980__ $$aARTICLE
000266791 980__ $$aWoS
000266791 981__ $$aoverwrite