Measurement-induced, spatially-extended entanglement in a hot, strongly-interacting atomic system.

ABSTRACT: Quantum technologies use entanglement to outperform classical technologies, and often employ strong cooling and isolation to protect entangled entities from decoherence by random interactions. Here we show that the opposite strategy-promoting random interactions-can help generate and preserve entanglement. We use optical quantum non-demolition measurement to produce entanglement in a hot alkali vapor, in a regime dominated by random spin-exchange collisions. We use Bayesian statistics and spin-squeezing inequalities to show that at least 1.52(4) × 10¹³ of the 5.32(12) × 10¹³ participating atoms enter into singlet-type entangled states, which persist for tens of spin-thermalization times and span thousands of times the nearest-neighbor distance. The results show that h

SUBMITTER: Kong J 

PROVIDER: S-EPMC7229029 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature