Light - Atoms quantum interface Eugene Polzik, Niels Bohr Institute

It is known that certain properties of a quantum system corresponding to non-commuting variables cannot be measured simultaneously. It turns out, however, that these properties can nevertheless be transferred from one system to another. Such a transfer is an important component of quantum information processing with applications that include quantum teleportation and quantum memory for light. I will describe our experiments on entanglement between light and atoms which plays a crucial role in these protocols. Although entanglement is often associated with elementary particles, in our experiments it is created between two distant and rather macroscopic objects.