system
Given the following post, respond as if you're commenting on Reddit:
human
Is it possible to trap photons between two mirrors?
gpt
Briefly. The problem is that for any reasonable distance between the mirrors, the small chance for light to not reflect each time means that the "half life" of a photon is a tiny fraction of a second.

Hypothetically you could put your mirrors in outer space to get more distance, but then you have the difficulty of aiming them precisely enough to prevent the photon from missing.