Optomechanical Bell Test

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Over the past few decades, experimental tests of Bell-type inequalities have been at the forefront of understanding quantum mechanics and its implications. These strong bounds on specific measurements on a physical system originate from some of the most fundamental concepts of classical physics-in particular that properties of an object are well-defined independent of measurements (realism) and only affected by local interactions (locality). The violation of these bounds unambiguously shows that the measured system does not behave classically, void of any assumption on the validity of quantum theory. It has also found applications in quantum technologies for certifying the suitability of devices for generating quantum randomness, distributing secret keys and for quantum computing. Here we report on the violation of a Bell inequality involving a massive, macroscopic mechanical system. We create light-matter entanglement between the vibrational motion of two silicon optomechanical oscillators, each comprising approx. 10(10) atoms, and two optical modes. This state allows us to violate a Bell inequality by more than 4 standard deviations, directly confirming the nonclassical behavior of our optomechanical system under the fair sampling assumption.
Publisher
AMER PHYSICAL SOC
Issue Date
2018-11
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.121, no.22

ISSN
0031-9007
DOI
10.1103/physrevlett.121.220404
URI
http://hdl.handle.net/10203/262452
Appears in Collection
PH-Journal Papers(저널논문)
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