Findings from Harvard University in physics reported.

Physics Week | November 3, 2009 | Copyright

According to a study from the United States, "It is generally believed that in spatial dimension d> 1, the leading contribution to the entanglement entropy S=-tr rho A log rho A scales as the area of the boundary of subsystem A. The coefficient of this ''area law'' is nonuniversal. However, in the neighborhood of a quantum critical point S is believed to possess subleading universal corrections."

"In the present work, we study the entanglement entropy in the quantum O(N) model in 1

The researchers concluded: "For N → infinity, this correction generally scales ...

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