Quantum mechanics–free subsystem with mechanical oscillators

doi:10.1126/science.abf5389

GSTDTAP > 气候变化

DOI	10.1126/science.abf5389
	Quantum mechanics–free subsystem with mechanical oscillators
	Laure Mercier de Lépinay; Caspar F. Ockeloen-Korppi; Matthew J. Woolley; Mika A. Sillanpää
	2021-05-07
发表期刊	Science
出版年	2021
英文摘要	Quantum entanglement occurs when two separate entities become strongly linked in a way that cannot be explained by classical physics; it is a powerful resource in quantum communication protocols and advanced technologies that aim to exploit the enhanced capabilities of quantum systems. To date, entanglement has generally been limited to microscopic quantum units such as pairs or multiples of single ions, atoms, photons, and so on. Kotler et al. and Mercier de Lépinay et al. demonstrate the ability to extend quantum entanglement to massive macroscopic systems (see the Perspective by Lau and Clerk). Entanglement of two mechanical oscillators on such a large length and mass scale is expected to find widespread use in both applications and fundamental physics to probe the boundary between the classical and quantum worlds. Science , this issue p. [622][1], p. [625][2]; see also p. [570][3] 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. [1]: /lookup/doi/10.1126/science.abf2998 [2]: /lookup/doi/10.1126/science.abf5389 [3]: /lookup/doi/10.1126/science.abh3419
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/325942
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Laure Mercier de Lépinay,Caspar F. Ockeloen-Korppi,Matthew J. Woolley,等. Quantum mechanics–free subsystem with mechanical oscillators[J]. Science,2021.
APA	Laure Mercier de Lépinay,Caspar F. Ockeloen-Korppi,Matthew J. Woolley,&Mika A. Sillanpää.(2021).Quantum mechanics–free subsystem with mechanical oscillators.Science.
MLA	Laure Mercier de Lépinay,et al."Quantum mechanics–free subsystem with mechanical oscillators".Science (2021).