Scientists successfully demonstrated a quantum 'Fredkin gate'

In a major breakthrough in quantum computing, scientists from Griffith University and the University of Queensland in Australia announced Monday that they had found a way to simplify a complicated logic operation by creating a quantum "Fredkin gate" for the first time ever. The development, detailed in the journal Science Advances, could bring fully functional quantum computers closer to reality.
Fredkin (controlled- SWAP) gate is a gate where two qubits are swapped depending on the value of the third.
Usually the Fredkin gate requires implementing a circuit of five logic operations. The research team used the quantum entanglement of photons—particles of light—to implement the controlled-SWAP operation directly.

http://www.rawstory.com/2016/03/scientists-successfully-create-a-quantum-fredkin-gate/
http://phys.org/news/2016-03-physicists-quantum-fredkin-gate.html

Paper: http://advances.sciencemag.org/content/2/3/e1501531