https://www.sciencedaily.com/releases/2018/05/180530113144.htm

Quantum phenomena are generally restricted to the atomic level, but there are cases -- such as laser light and superconductivity -- where the coherence of quantum phenomena allows them to be expressed at the macroscopic level. This is important for the development of quantum computers. However, they are also extremely sensitive to the environment, which destroys the very coherence that makes them meaningful.

The group, led by Seigo Tarucha of the RIKEN Center for Emergent Matter Science, set up a system of three quantum dots in which electron spins could be individually controlled with an electric field. They began with two entangled electron spins in one of the end quantum dots, while keeping the center dot empty, and transferred one of these spins to the center dot. They then swapped the center dot spin with a third spin in the other end dot using electric pulses, so that the third spin was now entangled with the first, which was not in contact with it. What was surprising, however, was that the entanglement was stronger than expected, and based on simulations, they realized that the environmental noise around the system was, paradoxically, helping the entanglement to form.