December 4, 2018 by Laurie Varma, US Department of Energy
... two entangled photons contained in a single strand of fiber-optic cable—is the "smallest quantum computer you can imagine. This paper marks the first demonstration of our frequency-based approach to universal quantum computing."
"A lot of researchers are talking about quantum information processing with photons, and even using frequency," said Lukens. "But no one had thought about sending multiple photons through the same fiber-optic strand, in the same space, and operating on them differently."
The team's quantum frequency processor allowed them to manipulate the frequency of photons to bring about superposition, a state that enables quantum operations and computing.