Quantum correlations from a room-temperature optomechanical cavity.

Autor: Purdy TP; Joint Quantum Institute, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. thomas.purdy@nist.gov., Grutter KE; Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Srinivasan K; Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Taylor JM; Joint Quantum Institute, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.; Joint Center for Quantum Information and Computer Science, University of Maryland, College Park, MD 20742, USA.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2017 Jun 23; Vol. 356 (6344), pp. 1265-1268.
DOI: 10.1126/science.aag1407
Abstrakt: The act of position measurement alters the motion of an object being measured. This quantum measurement backaction is typically much smaller than the thermal motion of a room-temperature object and thus difficult to observe. By shining laser light through a nanomechanical beam, we measure the beam's thermally driven vibrations and perturb its motion with optical force fluctuations at a level dictated by the Heisenberg measurement-disturbance uncertainty relation. We demonstrate a cross-correlation technique to distinguish optically driven motion from thermally driven motion, observing this quantum backaction signature up to room temperature. We use the scale of the quantum correlations, which is determined by fundamental constants, to gauge the size of thermal motion, demonstrating a path toward absolute thermometry with quantum mechanically calibrated ticks.
(Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.)
Databáze: MEDLINE
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