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Observable quantum entanglement due to gravity
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Observable quantum entanglement due to gravity
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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.
Forward citations
Cited by 3 Pith papers
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Classical and quantum mechanics across representations: an operational reading of the Wigner Weyl correspondence
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True and apparent motion of optomechanical resonators, with applications to feedback cooling of gravitational wave detector test masses
Extends prior two-photon formalism to compute true motion and optimal cooling in multi-DOF GW detector test masses, finding sub-unity occupation numbers possible over the oscillator bandwidth for common definitions.
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Entanglement dynamics of two mesoscopic objects with gravitational interaction
Gravitational interaction generates entanglement in two mesoscopic particles even with decoherence if coupling is strong, with computed optimal duration and a device-independent verification condition.
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