The experiment knocks the last nail into the coffin of local realism.

Local realism - Comment on 2015 October 23

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A central principle of physics: the local realism. It is violated by so-called entangled particles: The change of state of one particle influences the entangled partner also when it is far away. Read more:

Extracts from an article follow:

 

"Ghostly remote effect": Quantum experiment refutes Einstein

Physicists of the TU Delft want to have proven that the "Ghostly remote effect" exists. That would be a real breakthrough.

All of their life the two physicists Niels Bohr and Albert Einstein were connected by their favourite disputed question: Is quantum physics a complete theory, or must it be extended by further parameters so that nature can be described appropriately? While Bohr persisted in the completeness of the theory, Einstein created always new thought experiments to show the opposite. In the current edition of the specialist magazine "Nature" physicists of the Technical University Delft present an experiment with which they answer this disputed question in favour of Bohr.

It is about a central principle of physics: the local realism. It is violated by so-called entangled particles: The change of state of one particle influences the entangled partner also when it is far away. Einstein spoke of "ghostly remote effect".

After the physicist John Bell formulated a proposal 1964 to show experimentally whether the "ghostly remote effect" is real, a large number of experiments were made since the 1970s. En masse Bohr emerged as victor, but loopholes always remained up to now, therefore experimental hiding places, which stood in the way of a final answer.

The team from Delft describes the new experiment as "loophole-free". By choosing a new set-up and most current quantum technologies, the researchers around Ronald Hanson could decide the worldwide race for themselves. "We have proven that the ghostly remote effect exists", says Hanson.

"The experiment knocks the last nail into the coffin of local realism", writes Howard Wiseman of the Griffith University in "Nature", who did not participate in it.

 

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