This article discusses the recent invention of a "quantum radar" that works by bouncing one photon off of something, storing a photon that's entangled with it, and watching for interference on the stored photon that indicates the radar photon has bounced off an object.
Most of that makes sense, (about as much as anything in quantum physics makes sense, at least,) but... how exactly do you "store" a photon? To my mind at least, the concept of storage involves putting something in a location and keeping it there, unmoving, but photons are not capable of not moving at the speed of light. So what's going on in this scenario?
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