This isn't a quantum computing article, it's quantum sensing. Very different promise, level of investment, and current evidence. For example, LIGO has been us

This isn't a quantum computing article, it's quantum sensing. Very different promise, level of investment, and current evidence. For example, LIGO has been using squeezed light for increased sensitivity. Avalanche photodiodes are used in optical transceivers. I believe SQUIDs have been used in a number of medical applications. In every case here, the quantum sensors have been used to improve science experiments before eventually making it to market. I would be surprised if this doesn't also hold true for these diamond vacancy centres. Edit: To clarify, the article does mention quantum computers in it's introduction. But quantum sensors are then presented as almost an "opposite" to quantum computers.