We all known that RSA can be compromised using quantum Shor's algorithm. The horsepower underlying this algorithm is the Fourier transform. However, we can use alternatives to perform this function, such as An optical Fourier transform coprocessor with direct phase determination.
In accordance to the paper, you may need a high resolution optical sensor for this task. But how high does it need to be? Can we get a rough estimation using a lower resolution and guess something close?
Are such alternatives viable (in a near future) to break RSA?
PS: The largest optical sensor in existence is a 3.2 gigapixel