To capture single photons, researchers create an interference ‘wall’
https://pme.uchicago.edu/news/capture-single-photons-researchers-create-interference-wall

EXCERPT
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Theorists at the Pritzker School of Molecular Engineering (PME) at the University of Chicago have developed a new scheme for trapping single photons in a cavity.
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Creating a ‘wall’ of interference

Typical systems for trapping single photons in a cavity involve using materials that have an extremely large optical nonlinearity, which forces photons in the cavity to interact with one another strongly. In such systems, the cavity’s resonance frequency can be strongly shifted by adding even just one photon. If one then shines a laser on the cavity, one photon can enter, but not a second (because of the frequency shift produced by the first photon).

"We think this scheme COULD WORK in a lot of different systems. If you don’t need special materials, it really expands the potential of light-based quantum technologies."

Prof. Aashish Clerk

The problem with this mechanism is that it requires extremely large optical nonlinearities and very low dissipation, a combination that is extremely difficult if not impossible to achieve in most platforms.
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THEORETICALLY MY ASS.

Define clearly what a photon is, first.