Quantum computing might remain a problem; largely from the difficulty of error-correction. But by that token, much work has been done on error-correction. h/t Reynolds, here's the quantum telescope.
To be exact: this is the quantum-corrected visible-wavelength interferometer. So far interferometers tend to the radio, no lower-frequency / higher-wavelength than a microwave (let alone "red").
Mind, higher wavelength than blue - like red, again - gets subject to Rayleigh-scattering. So this 'scope is probably best for an airless environment like, oh, the dark side of Luna (when actually dark).
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