Prem Kumar
For now, full-fledged quantum computers are the stuff of science fiction - in last summer's blockbuster movie Transformers, the bad guys use quantum computing to break into the U.S. Army's secure files in just 10 seconds flat.

But Prem Kumar, the AT&T Professor of Information Technology in the Department of Electrical Engineering and Computer Science and the director of the Center for Photonic Communication and Computing, and his research group are one step closer to realizing that technology - though for far better purposes. The group recently demonstrated one of the basic building blocks for distributed quantum computing using entangled photons generated in optical fibers, and their research was reported in the April 4 edition of Physical Review Letters.

"Because it is done with fiber and the technology that is already globally deployed, we believe that it is a significant step in harnessing the power of quantum computers," Kumar says.

Quantum computing differs from classical computing in that a classical computer works by processing "bits" that exist in two states, either one or zero. Quantum computing uses quantum bits, or qubits, which, in addition to being one or zero can also be in a "superposition," which is both one and zero simultaneously. This is possible because qubits are quantum units like atoms, ions, or photons that operate under the rules of quantum mechanics instead of classical mechanics.........