It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Physicists have long suspected that quantum mechanics allows two observers to experience different, conflicting realities. Now they’ve performed the first experiment that proves it.
And today, Massimiliano Proietti at Heriot-Watt University in Edinburgh and a few colleagues say they have performed this experiment for the first time: they have created different realities and compared them. Their conclusion is that Wigner was correct—these realities can be made irreconcilable so that it is impossible to agree on objective facts about an experiment.
They use these six entangled photons to create two alternate realities—one representing Wigner and one representing Wigner’s friend. Wigner’s friend measures the polarization of a photon and stores the result. Wigner then performs an interference measurement to determine if the measurement and the photon are in a superposition.
The experiment produces an unambiguous result. It turns out that both realities can coexist even though they produce irreconcilable outcomes, just as Wigner predicted.
That raises some fascinating questions that are forcing physicists to reconsider the nature of reality.
originally posted by: TEOTWAWKIAIFF
3 is one of those universals truths.
originally posted by: TEOTWAWKIAIFF
@Kilgore, you take baby steps before you walk or run. After “3” you get others that always pop up. 11:11 being a bit more complex; my number is “23” which is a fun bunny hole; Peeps has hers; other Cafeterians seem to have one. But the first natural step is 3.
Photons only interact with charged particles, so they shouldn’t interact with themselves. But quantum physics allows for a photon to temporarily fluctuate into a particle-antiparticle pair (such as an electron-positron pair), and one of these charged particles can absorb a second photon. When these intermediate particles recombine, they emit two photons. The whole process appears as two photons ricocheting off each other, but it has only been observed indirectly by its effect on the magnetic moments of the electron and muon.
synopsis of photon photon interaction
In their direct detection strategy, David d’Enterria of CERN, Switzerland, and Gustavo Silveira of the Catholic University of Louvain in Belgium propose using the large flux of “quasireal” photons in the LHC. These are not physical photons but instead are the carriers of the strong electromagnetic forces that surround the protons or lead ions zooming around in the collider. If two quasireal photons scatter off each other, they assume a real nature and can be detected in the LHC detectors. Using computer simulations, the authors show that lead-lead collisions provide the best opportunity for seeing these photon-photon scattering events. Any deviation from the predicted counts could be evidence of new physics, such as the existence of supersymmetry. – Michael Schirber