To measure small things you need comparably short wavelengths.  If you make a photon with a wavelength so short it can measure the Planck length it will have so much mass-energy that it will fold spacetime around it and become a black hole...so you won't be able to use it to measure anything.

Brent

On 1/5/2019 11:39 PM, agrayson2...@gmail.com wrote:
What is the argument for the claim that we cannot, in principle, measure any length smaller than Planck length? TIA, AG

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