Over 100k people challenge Einstein in global experiment

They moved mirrors, polarising filters, waveplates - elements located on optical tables and that affect the type of measurements that are made on the different quantum systems in each lab.

London, Dec 11 Over 100,000 people from laboratories around the world for the first time have conducted a unique global experiment that verified the laws of quantum physics, thus refuting Albert Einstein's understanding of the microscopic world.

Twelve laboratories from around the world came together to put in motion the BIG Bell Test. The experiment - coordinated by ICFO-The Institute of Photonic Sciences in Spain - powered by human randomness is aimed to demonstrate that the microscopic world is in fact as strange as quantum physics predicts.

Predictions such as particles behaving in a random way, determining their properties only when we look at them; strange instantaneous interactions at a distance - were all questioned by Einstein, who rejected them completely.

During the 48 hours in which it was November 30th at different place on the planet, participants contributed to the initiative, generating sequences of zeros and ones as random as possible through a video game. Each of these bits was used to control in real-time the experimental conditions of the labs.

They moved mirrors, polarising filters, waveplates - elements located on optical tables and that affect the type of measurements that are made on the different quantum systems in each lab.

Together all the participants provided scientists with millions of unpredictable, independent decisions which were used to measure their particles. This independence is a crucial feature for the conclusions of the Bell tests to be valid.

Using the sequences provided by the participants, the scientists have been able to verify whether or not their particles were intertwined by the "spooky action at a distance" that Einstein could not accept.

The Bell test states that experimentalists have to do their measurements with the help of human decisions and calculate the "Bell parameter" (known as the parameter S). If the world is, as Einstein believes, predictable and without "spooky actions at a distance", then S cannot be greater than 2. Otherwise, the inequality has been violated, indicating the presence of intrinsically quantum phenomena.

By 13:00 Central European Time (CET), the minimum number of participations needed to assure enough bits to power the experiments had already been surpassed, registering above 1,000 bits per second in a stable manner over the course of several hours.

By early afternoon, some of the labs had been able to obtain preliminary results, confirming violations of Bell's inequality, and thus refuting Einstein, giving their complete support to the predictions of quantum physics.

"The project required contributions from many people in very different areas: the scientists pushed their experiments to new limits, the public very generously gave us their time in support of science, and educators found new ways to communicate between these two groups," said Morgan Mitchell, professor at ICFO.

PTI