We can go quite higher. We are limited by inverse of the highest frequency carrier signal we can generate. Right now, that is 10^27ish for photons at the LHC. [

We can go quite higher. We are limited by inverse of the highest frequency carrier signal we can generate. Right now, that is 10^27ish for photons at the LHC. [1] [1] https://www.quora.com/What-was-the-highest-frequency-that-man-has-ever-created https://www.quora.com/What-was-the-highest-frequency-that-ma...