quantum loophole: some quirks of physics can be good for science - laser light measurement device

As we all know, quantum theory limits the accuracy of our measurements.
But quirks in the quantum field can also be transformed into advantages.
Physicists have now proved that when measuring distances using photons, the measurement accuracy is almost twice as high as the original.
Like a marker on a ruler, the ordered wave of the laser can be used to measure the length.
In the interferometer, a laser beam is divided into two different paths.