An unknown quantum state can be faithfully teleported between a sender (Alice) and a receiver (Bob) who can communicate through a classical channel and who have a shared resource of quantum entanglement.  In our teleportation lab, squeezed states of light are used to generate entangled Einstein-Podolsky-Rosen (EPR) states, which we have used to demonstrate quantum teleportation of continuous variables.

Nikos Georgiades and Eugene Polzik studied quantum interference in atomic multiphoton excitation processes due to the presence of multiple excitation pathways. Atoms can be used as quantum nonlinear mixers and in precision frequency metrology applications for measuring arbitrary optical frequencies.

Experiments included the excitation of cesium atoms in a squeezed vacuum and the use of squeezed light as an input to a cavity QED system (here, an atom strongly coupled to a high-finesse optical resonator).