![]() ![]() ![]() student Christoffer Østfeldt explains further: "Imagine the different ways of realizing quantum states as a kind of zoo of different realities or situations with very different qualities and potentials. Entangled systems can remain perfectly correlated even if they are at a distance from each other-a feature that has puzzled researchers from the very birth of quantum mechanics more than 100 years ago. "Quantum mechanics is like a double-edged sword-it gives us wonderful new technologies, but also limits precision of measurements which would seem just easy from a classical point of view," says a team member, Michał Parniak. In their experiment, Eugene Polzik's team entangled the systems, which means that they move in a correlated way with a precision better than the zero-point motion. This limits knowledge about any of the systems. Such correlated motion is normally limited to the so-called zero-point motion-the residual, uncorrelated motion of all matter that occurs even at absolute zero temperature. If both objects move randomly, but if observed moving right or left at the same time, that is called a correlation. To understand entanglement, sticking to the example of spins entangled with a mechanical membrane, imagine the position of the vibrating membrane and the tilt of the total spin of all atoms, akin to a spinning top. With the new result, entanglement between very different objects has become possible." ![]() The bigger the objects, the further apart they are, the more disparate they are, the more interesting entanglement becomes from both fundamental and applied perspectives. Professor Eugene Polzik, who led the effort, states that: "With this new technique, we are on route to pushing the boundaries of the possibilities of entanglement. Atoms can be useful in processing quantum information and the membrane-or mechanical quantum systems in general-can be useful for storage of quantum information. Researchers succeeded in making entanglement between a mechanical oscillator-a vibrating dielectric membrane-and a cloud of atoms, each acting as a tiny magnet, or what physicists call "spin." These very different entities were possible to entangle by connecting them with photons, particles of light. It can be understood as a quantum link between two objects which makes them behave as a single quantum object. Entanglement is the basis for quantum communication and quantum sensing. ![]()
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