Quantum mechanics-free subsystem with mechanical oscillators

被引：141

作者：

de Lepinay, Laure Mercier ^{[1
]}

Ockeloen-Korppi, Caspar F. ^{[1
,3
]}

Woolley, Matthew J. ^{[2
]}

Sillanpaa, Mika A. ^{[1
]}

机构：

[1] Aalto Univ, QTF Ctr Excellence, Dept Appl Phys, FI-00076 Aalto, Finland

[2] UNSW Canberra, Sch Engn & Informat Technol, Canberra, ACT 2600, Australia

[3] IQM Finland Oy, Keilaranta 19, Espoo 02150, Finland

来源：

SCIENCE | 2021年 / 372卷 / 6542期

基金：

芬兰科学院; 欧洲研究理事会;

关键词：

EVADING MEASUREMENT; ENTANGLEMENT; MOTION; NOISE; FORCE;

D O I：

10.1126/science.abf5389

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：625 / +

页数：23

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