The vibrating drumheads may also serve as interfaces for connecting nodes of large-scale, distributed quantum networks. In the future, the research group will use these ideas in laboratory tests aiming at probing the interplay of quantum mechanics and gravity. ![]() Therefore, the experiments were carried out at a very low temperature, only a hundredth a degree above absolute zero at -273 degrees. In macroscopic objects, quantum effects like entanglement are very fragile, and are destroyed easily by any disturbances from their surrounding environment. A quantum computer can, for example, carry out the types of calculations needed to invent new medicines much faster than any supercomputer ever could. Entanglement allows pairs of objects to behave in ways that contradict classical physics, and is the key resource behind emerging quantum technologies. Entangled objects cannot be described independently of each other, even though they may have an arbitrarily large spatial separation. "One of the drums responds to all the forces of the other drum in the opposing way, kind of with a negative mass," Sillanpää says.įurthermore, the researchers also exploited this result to provide the most solid evidence to date that such large objects can exhibit what is known as quantum entanglement. Breaking the rule allows them to be able to characterize extremely weak forces driving the drumheads. This means that the researchers were able to simultaneously measure the position and the momentum of the two drumheads - which should not be possible according to the Heisenberg uncertainty principle. In this situation, the quantum uncertainty of the drums' motion is cancelled if the two drums are treated as one quantum-mechanical entity," explains the lead author of the study, Dr. ![]() The drums vibrate in an opposite phase to each other, such that when one of them is in an end position of the vibration cycle, the other is in the opposite position at the same time. "In our work, the drumheads exhibit a collective quantum motion. ![]() The drumheads were carefully coerced into behaving quantum mechanically. The Helium Atom According to quantum mechanics and the Heisenberg uncertainty principle, the precise location of an electron within an atom cannot be known. Instead of elementary particles, the team carried out the experiments using much larger objects: two vibrating drumheads one-fifth of the width of a human hair. Matt Woolley from the University of New South Wales in Australia, who developed the theoretical model for the experiment. Mika Sillanpää at Aalto University in Finland has shown that there is a way to get around the uncertainty principle. In recent research, published in Science, a team led by Prof.
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