> measure small variations in the earth's gravity This would be incorrect. It is just a very accurate, unproven in the field, accelerometer. https://www.yout

> measure small variations in the earth's gravity This would be incorrect. It is just a very accurate, unproven in the field, accelerometer. https://www.youtube.com/watch?v=XwKKOPd-5cU https://www.youtube.com/watch?v=XwKKOPd-5cU - "Royal Navy's experimental ship carries out first trial of quantum navigation system" "The quantum accelerometer uses ultracold atoms to make highly accurate measurements. When cooled to extremely low temperatures the atoms start to display their ‘quantum’ nature, resulting in wave-like properties. As the atoms move through the sensor, an ‘optical ruler’ is formed by using a series of laser pulses. This allows the acceleration of the atoms to be precisely measured."