Nature, Published online: 08 June 2022; doi:10.1038/d41586-022-01497-2

Continuous amplification of coherent matter waves has been demonstrated, allowing an exotic state of matter called a Bose–Einstein condensate to be maintained indefinitely. This set-up is the matter-wave analogue of an optical laser enclosed by fully reflective mirrors, and it could have uses in both applied and fundamental physics.

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