http://physicsworld.com/cws/article/news/42847
Researchers in Cambridge in the UK have succeeded in generating entangled photons using electricity alone, with a new device called an "entangled light-emitted diode" (ELED). The device converts electrical current directly into entangled light rather than relying on laser power as in previous technology. The technique could be a practical way to integrate many entangled light sources together on a single chip – something that will be crucial for making a real-world optical quantum computer.
LED entangler
LED entangler
Entanglement allows particles to have a much closer relationship than is possible in classical physics: if two particles are entangled, we can automatically know the state of one particle by measuring the state of the other – despite the state of either being impossible to guess before the measurement. For example, two photons can be entangled such that they are always measured to have the same linear polarizations, even though we cannot predict that polarization beforehand.