Using quantum entanglement to study proteins | 12/6/2018 | Staff
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For the first time, a University of Michigan chemist has used quantum entanglement to examine protein structures, a process that requires only a very small number of photons of light.

Traditionally, scientists have used powerful laser scanning microscopes to study proteins on the molecular scale. But traditional lasers present two problems. First, the intensity of the laser can damage the sample examined. Second, the laser blasts the sample with photons, which then scatter away from the target.

U-M - Professor - Chemistry - Theodore - Goodson

Instead, U-M Professor of Chemistry Theodore Goodson and his team's method of using quantum entanglement uses only a small number of photons to learn about molecules. In this case, the team studied flavins, a group of enzymes critical to energy metabolism in the body.

Quantum entanglement is the idea that the properties of a pair or group of particles depend upon each other, even if the particles are separated by great distances. For example, if one particle is spinning in a clockwise position, the other in its pair will spin the opposite way, if they are entangled. This relationship persists even if the particles are thousands of kilometers away, Goodson said.

Photons - Degree - Correlation - Molecules - Proteins

"It turns out that if you have photons that are entangled, that high degree of correlation can interact with molecules of proteins in a different way than if they're not entangled," Goodson said. "We are able to probe the properties of the proteins with extremely small numbers of photons."

Entangled photons are produced by sending laser light through a crystal no bigger than the tip of a fingernail. When the light travels through the crystal in a certain way, some of the photons become entangled. These entangled pairs are then used to examine the target molecules.

Photons - States - Protein

These photons excite electronic states in the protein....
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