Scientists Use Quantum “Spooky Action” to Entangle Objects You Can Actually See
But a UChicago physicist is among a group of researchers that announced April 26 in Nature that they had managed to entangle perhaps the largest items yet, at a whopping 20 microns across—about the diameter of a single human hair.
Scientists say that harnessing the mysterious property that Albert Einstein called “spooky action at a distance” is a crucial step toward exploiting quantum quirks for technology such as new kinds of sensors or computers.
An illustration of an experiment where scientists entangled the vibrations of tiny drumheads, each the diameter of a human hair.
Credit: Aalto University / Petja Hyttinen & Olli Hanhirova, ARKH Architects.
A group led by Mika Sillanpaa at Aalto University in Finland put the idea to the test. They used a circuit to entangle the motion of two aluminum plates, each one vibrating like a tiny drumhead. Not only did it work, but they were able to keep the plates entangled for times approaching an hour. (For most systems, the time you can maintain entanglement is measured in microseconds or even shorter.)
“Looking towards the future, there’s a lot of interest in using mechanical objects in quantum regimes for applications,” Clerk said. This includes powerful new kinds of sensors, with potential applications ranging from new ways to look inside the human body to even better methods to detect ripples of gravitational waves from faraway stars and black holes.
Such mechanical objects also could be a powerful way to integrate different systems to make up a quantum computer or quantum network, Clerk said. “Mechanical motion could be a kind of ‘bus’ for quantum information.”
Besides Aalto and UChicago, other scientists in the study hailed from Finland’s University of Jyväskylä and UNSW Canberra in Australia.
Citation: “Entangled massive mechanical oscillators.” Nature, Ockeloen-Korppi et al, April 26, 2018.
Funding: Academy of Finland, European Research Council, European Commission.
Source: http://www.ineffableisland.com/2018/04/scientists-use-quantum-spooky-action-to.html
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