Entangled photons: 'spooky action' works at a distance.

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    • Abstract:
      The article presents an experiment on the quantum mechanics of entangled photons. Entanglement of photon pairs can be done in more than one degree of freedom. Although most experiments entangle only one degree of freedom, some have simultaneously entangled two properties. Other groups have demonstrated entanglement of three, four, and recently five photons. Current experiments have some limitations. Entangled pairs must be generated at low rates to produce the right quantum properties. Multiphoton entanglement requires a multistage process so it produces lower powers.