Diamonds showed Quantum entanglement

Entangled DiamondsScientists have found an interesting phenomenon of quantum entanglement in Diamonds.

This research has been done by researchers from University of Oxford and collaborators from National Research Council of Canada and Centre for Quantum Technologies, National University of Singapore, and published online in December 2 issue of the journal Science.

Entanglement is the process in which one object is connected to the other in such a way that an action on one object affects the other even if they are placed at a distance from each other. This process is commonly seen in subatomic particles and predicted by theory of quantum mechanics. However, this research clearly shows that some of the phenomenon of quantum level can occur at macroscopic level at normal temperature.

Researchers including physicist Ian Walmsley of England’s University of Oxford set up an apparatus to send a laser pulse from two diamonds simultaneously. They found that the light changed frequency to a lower one after striking the diamond meaning it had lost some of the energy. Then the researchers found that the energy converted into vibration energy in the diamonds. However, it was unclear which diamond was vibrating. They, then, sent laser light through the vibrating system to find if the system released energy and changed the frequency of the light to a higher state. Researchers set up two different detectors to measure the laser light for the different diamonds and found a complete connection between both of them i.e. the two diamonds behaved as a single entity.

Researchers reported, “We showed that the quantum state of the diamonds has positive concurrence with 98% probability.”


K. C. Lee, M. R. Sprague, B. J. Sussman, J. Nunn, N. K. Langford, X.-M. Jin, T. Champion, P. Michelberger, K. F. Reim, D. England, D. Jaksch, I. A. Walmsley, (2011). Entangling Macroscopic Diamonds at Room Temperature. Science, DOI: 10.1126/science.1211914

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