Observable quantum entanglement due to gravity

被引:104
|
作者
Krisnanda, Tanjung [1 ]
Tham, Guo Yao [1 ]
Paternostro, Mauro [2 ]
Paterek, Tomasz [1 ,3 ,4 ,5 ,6 ,7 ]
机构
[1] Nanyang Technol Univ, Sch Phys & Math Sci, Singapore 637371, Singapore
[2] Queens Univ, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland
[3] Univ Cote Azur, CNRS, UMI 3654, MajuLab,Int Joint Res Unit, Nice, France
[4] Sorbonne Univ, Paris, France
[5] Natl Univ Singapore, Singapore, Singapore
[6] Nanyang Technol Univ, Singapore, Singapore
[7] Univ Gdansk, Inst Theoret Phys & Astrophys, Fac Math Phys & Informat, PL-80308 Gdansk, Poland
关键词
MOTION; SIDE;
D O I
10.1038/s41534-020-0243-y
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
No experiment to date has provided evidence for quantum features of the gravitational interaction. Recently proposed tests suggest looking for the generation of quantum entanglement between massive objects as a possible route towards the observation of such features. Motivated by advances in optical cooling of mirrors, here we provide a systematic study of entanglement between two masses that are coupled gravitationally. We first consider the masses trapped at all times in harmonic potentials (optomechanics) and then the masses released from the traps. This leads to the estimate of the experimental parameters required for the observation of gravitationally induced entanglement. The optomechanical setup demands LIGO-like mirrors and squeezing or long coherence times, but the released masses can be light and accumulate detectable entanglement in a timescale shorter than their coherence times. No macroscopic quantum superposition develops during the evolution. We discuss the implications from such thought experiments regarding the nature of the gravitational coupling.
引用
收藏
页数:6
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