Observable quantum entanglement due to gravity

Tanjung Krisnanda*, Guo Yao Tham, Mauro Paternostro, Tomasz Paterek*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

101 Citations (Scopus)
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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.
Original languageEnglish
Article number12
Number of pages6
Journalnpj Quantum Information
Early online date30 Jan 2020
Publication statusEarly online date - 30 Jan 2020


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