This is the strongest result yet, and it upends common-sense ideas about physical reality. 🌌
physicists – call them Alice and Bob – each with their own friends in two distant labs.There’s another twist: Charlie and Debbie are now measuring a pair of entangled particles, like in the Bell experiments.
This different measurement always gives a positive outcome for Alice if Charlie is entangled with his observed particle in the way calculated by Wigner. Likewise for Bob and Debbie.In any realization of this measurement, however, any record of their friend’s observation inside the lab is blocked from reaching the external world. Charlie or Debbie will not remember having seen anything inside the lab, as if waking up from total anaesthesia.
Next, we did an experiment to confirm the quantum mechanical predictions using pairs of entangled photons. The role of each friend’s measurement was played by one of two paths each photon may take in the setup, depending on a property of the photon called “polarisation”. That is, the path “measures” the polarisation.
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