Harvard's Lene Hau can slow light to a complete stop in a supercooled cloud.

One laser is shot across the width of a cloud of Bose-Einstein condensate, only a billionth of a degree above absolute zero.

This controls the speed of a second pulsed laser beam shot along the length of the cloud.

The first laser sets up a quantum interference such that the moving light beams of the second laser interfere with each other.

When everything is set up just right, the light can be slowed by a factor of 20 million or more.

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