Light passing through a lens bends slightly. For an optical computer, this is like a warped mirror for an artist: the image is there, but the details blur. An Ising machine using light beams tackles problems like packing luggage or planning a courier's route. But until now, it could only look through a small, flattest patch of its 'mirror.'
The researchers found a way to straighten this mirror. They measure exactly how the light wave is distorted and correct it to within one-fortieth of a wavelength. That's finer than a scratch on glass. Now the machine uses the entire area of the light modulator, not just its center. A second correction evens out the brightness of light at the edges, so each beam carries equal weight in the calculation.
Now the optical computer sees the whole problem. No more blind spots or skewed details. It's like putting on glasses with perfectly matched lenses: the world becomes sharp from edge to edge.
The wave correction accuracy is one-fortieth of the wavelength of light. That's about a hundred times thinner than a human hair.