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In principle, a quantum radar functions like a regular radar — only that instead of sending out a single beam of electromagnetic energy, it uses two split streams of entangled photons. Only one of these beams is sent out, but due to a quirk of quantum physics both streams will display the same changes, despite being potentially miles apart. As a result, by looking at the stream which remains back home it’s possible to work out what has happened to the other beam.
Wouldn't this imply faster-than-light information transfer? Is there any way that the interactions of a remote particle can influence a local entangled particle?