BabySinister t1_issidpz wrote on October 18, 2022 at 11:48 AM

Reply to comment by the1ine in A “Green” Quantum Sensor. Researchers have demonstrated a quantum sensor that can power itself using sunlight and an ambient magnetic field, an achievement that could help reduce the energy costs of this energy-hungry technology. by MistWeaver80

So if you read the article it says in many quantum test setups you need a powerful laser and microwave generator, so you need an external power source to run the experiment. These researchers designed an alternative test setup that uses sunlight in place of the powerful laser and the earth magnetic field in place of the microwave generator to perform similar tests, so you don't need much external power to run the tests anymore.