Researchers demonstrate quantum entanglement, prove Einstein wrong

cnet.com

3 pointsck22 comments

Summary in sixth paragraph:

The team split a single photon between two laboratories and tested whether the choice of measurement in one caused a change in the local quantum state in the other laboratory; using a homodyne detector with six different settings, they were able to quantitatively verify the waveform collapse and the entanglement of the split single photon -- the strongest proof yet of single-particle quantum entanglement.

But how do you "split a photon"? Mirrors?

Yes, you use a 50% mirrored surface. The chance of the photon being reflected or passing through are approximately equal, and dependent on quantum interactions with the mirror material.

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