Controlled entanglement of two field modes in a cavity quantum electrodynamics experiment
Arno Rauschenbeutel, Patrice Bertet, S. Osnaghi, Gilles Nogues, M. Brune, J. M. Raimond, S. Haroche · Physical Review A · 2001
Using a single circular Rydberg atom, we have prepared two modes of a superconducting cavity in a maximally entangled state. The two modes share a single photon. The entanglement is revealed by a second atom probing the correlations between the two modes after a delay. This experiment opens interesting perspectives for quantum information manipulation and fundamental tests of quantum theory.