Four photons entangled in orbital angular momentum

Moving toward practical applications for quantum entanglement!

For the first time, scientists have entangled four photons in their orbital angular momentum. Leiden physicists sent a laser through a crystal, thereby creating four photons with coupled rotation. So far, this has only been done for two photons. The discovery makes uncrackable secret communication of complex information possible between multiple parties.

Source: Four photons entangled in orbital angular momentum

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