Observable quantum entanglement due to gravity

Understand

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.