A Twin Photon Source Based on All-Optical Fiber

Jingyun Fan, Alan Migdall and Lijun Wang

The most important question in cryptography is how to ensure the security of a message between its sender and receiver. A quantum approach is desirable because detecting and duplicating a photon’s quantum state—that is, sending a message and keeping a copy— is prohibited by the laws of quantum mechanics. A new light source brings quantum cryptography closer to reality.

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