Science NewsCurated by RSF Research Staff Home > Science News > Test of photonic entanglement in accelerated reference frames Another important report has been released on experimental tests within the unified physics regime. Following a recent report in which a key tenet of relativity was tested in quantum systems (at the atomic scale), a new study by another research team is reporting on the results of testing quantum mechanical phenomena (like entanglement) in relativistic systems. This is a particularly interesting investigation because quantum phenomena are non-local in nature (implying instantaneous action across causally discontinuous spaces), whereas relativity is necessarily local -- because any kind of nonlocal interaction would seem to abolish the relativity of simultaneity, and thus the entire concept of relative frames of reference. Although this would seem to imply a complete incompatibility between relativity and quantum theory (suggesting one of them must be incomplete) it is not a serious problem in the Born-Heisenberg model, the orthodox interpretation of quantum mechanics, because the nonlocal wavefunction is not describing something real -- it is describing a probability density that does not become something real, like particles with actual positon and velocity, until a "measurement" is performed collapsing the wavefunction. However, in quantum theories that stipulate realism (the idea that there is a real particle and a real wave even when such a system is not being observed or measured), the non-locality intrinsic to quantum phenomena becomes generally incompatible with relativity theory. This is one of the primary objections to the de Broglie-Bohm Pilot Wave theory, because it incorporates a guiding wave equation in which the velocity of a given particle depends on the instantaneous positions of all the other particles. While this is generally incompatible with the principle of the relativity of simultaneity, it is not incompatible with alternatives of relativity like the Lorentz-Fritzgerald ether theory. Many proponents of Bohmian ideas have thus become resigned to the notion that relativistic Bohmian theories will be relativistic only at the relatively superficial level of empirical predictions: the theories will make relativistically good predictions (including, for example, the correct kind of prediction for the Michelson-Morley experiment) but will involve something like a hidden, empirically undetectable, notion of absolute simultaneity. Such theories, it is usually conceded, are relativistic only in the sense that the Lorentz-Fitzgerald ether theory (considered here as an interpretation of classical electrodynamics) is relativistic – namely, they are not relativistic, not in a serious or fundamental sense. Tests that involve both relativistic and quantum mechanical regimes will assist in determining the merits of existing theories and the best path towards a unified physics. One phenomenon whose limits have not been fully tested in all regimes is quantum entanglement of spatially separated quantum systems. Entanglement can spread quantum superpositions over macroscopic distances and has been experimentally found to exist over distances as large as 144 km. The non-local character of these superpositions then seems in conflict with the local nature of relativity. This raises the question of whether entanglement persists, when we consider non-inertial reference frames, such as those experienced by accelerated systems or systems in gravitational fields, as the space-time metric can vary with position in these cases. It is likely that the resolution of such questions will be a key piece in the puzzle leading to a full theory of quantum gravity. Hence, quantum entangled systems subjected to high- and low-accelerations is one regime, where new physical phenomena might potentially arise. It is known that experimental investigations involving simulated hyper- or milligravity can cause unexpected changes to physical phenomena. Exposing physical systems to such extreme conditions can aid in the understanding of that system, and lead to a deeper understanding of the physical processes themselves. -- Experimental test of photonic entanglement in accelerated reference frames Article: https://phys.org/news/2017-05-unbreakable-quantum-entanglement.html Measuring gravitational waves to see inside starsSeptember 20, 2017New progress in Quantum Machine LearningSeptember 19, 2017The emergent physics of animal locomotionSeptember 19, 2017Water Droplets SuperpropulsionSeptember 18, 2017Supernova observations helping understand general relativitySeptember 18, 2017 Sharing is caring - please share this with your friends: Facebook Twitter If you like this content, you will love the Resonance Academy.