title: Entangling macroscopic diamonds at room temperature.
abstract: Quantum entanglement in the motion of macroscopic solid bodies has implications both for quantum technologies and foundational studies of the boundary between the quantum and classical worlds. Entanglement is usually fragile in room-temperature solids, owing to strong interactions both internally and with the noisy environment. We generated motional entanglement between vibrational states of two spatially separated, millimeter-sized diamonds at room temperature. By measuring strong nonclassical correlations between Raman-scattered photons, we showed that the quantum state of the diamonds has positive concurrence with 98% probability. Our results show that entanglement can persist in the classical context of moving macroscopic solids in ambient conditions.
authors.affiliation: Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, UK.
authors.forename: K C
authors.initials: KC
authors.lastname: Lee
authors.forename: M R
authors.initials: MR
authors.lastname: Sprague
authors.forename: B J
authors.initials: BJ
authors.lastname: Sussman
authors.forename: J
authors.initials: J
authors.lastname: Nunn
authors.forename: N K
authors.initials: NK
authors.lastname: Langford
authors.forename: X-M
authors.initials: XM
authors.lastname: Jin
authors.forename: T
authors.initials: T
authors.lastname: Champion
authors.forename: P
authors.initials: P
authors.lastname: Michelberger
authors.forename: K F
authors.initials: KF
authors.lastname: Reim
authors.forename: D
authors.initials: D
authors.lastname: England
authors.forename: D
authors.initials: D
authors.lastname: Jaksch
authors.forename: I A
authors.initials: IA
authors.lastname: Walmsley