Projects per year
Abstract
Quantum mechanics sets a limit for the precision of continuous measurement of the position of an oscillator. We show how it is possible to measure an oscillator without quantum back-action of the measurement by constructing one effective oscillator from two physical oscillators. We realize such a quantum mechanics-free subsystem using two micromechanical oscillators, and show the measurements of two collective quadratures while evading the quantum back-action by 8 decibels on both of them, obtaining a total noise within a factor of 2 of the full quantum limit. This facilitates the detection of weak forces and the generation and measurement of nonclassical motional states of the oscillators. Moreover, we directly verify the quantum entanglement of the two oscillators by measuring the Duan quantity 1.4 decibels below the separability bound.
Original language | English |
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Pages (from-to) | 625-629 |
Number of pages | 23 |
Journal | Science (New York, N.Y.) |
Volume | 372 |
Issue number | 6542 |
DOIs | |
Publication status | Published - 7 May 2021 |
MoE publication type | A1 Journal article-refereed |
Fingerprint
Dive into the research topics of 'Quantum mechanics-free subsystem with mechanical oscillators'. Together they form a unique fingerprint.Projects
- 5 Finished
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-: European Microkelvin Platform
Hakonen, P. (Principal investigator)
01/01/2019 → 31/12/2023
Project: EU: Framework programmes funding
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Quantum squeezing and entanglement in microwave optomechanical systems
Ockeloen-Korppi, C. (Principal investigator)
01/09/2017 → 31/08/2020
Project: Academy of Finland: Other research funding
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Quantum mechanics of mechanics
Sillanpää, M. (Principal investigator), Wang, C. (Project Member), Damskägg, E. (Project Member), Mercier de Lepinay, L. (Project Member), Mishra, H. (Project Member), Liu, Y. (Project Member), Välimaa, A. (Project Member) & Rej, E. (Project Member)
01/09/2017 → 31/08/2021
Project: Academy of Finland: Other research funding
Equipment
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OtaNano – Low Temperature Laboratory
Savin, A. (Manager) & Rissanen, A. (Other)
OtaNanoFacility/equipment: Facility