Assuming this is both scalable and at least as efficient as current technology, this is a really big deal.
And it's also proof the USA is no longer at the front of the technology wave – all because we've deliberately withheld funding from renewables research. Our leaders are such fucking idiots.
ETA: Here's a non-paywalled article:
> https://interestingengineering.com/energy/china-heat-pump-turns-sunlight-into-heat