Towards experimental entanglement connection with atomic ensembles in the single excitation regime
Julien Laurat, Chin-wen Chou, Hui Deng, Kyung Soo Choi, D. Felinto, Hugues de Riedmatten, Harry J. Kimble · New Journal of Physics · 2007
We present a protocol for performing entanglement connection between pairs of atomic ensembles in the single excitation regime. Two pairs are prepared in an asynchronous fashion and then connected via a Bell measurement. The resulting state of the two remaining ensembles is mapped to photonic modes and a reduced density matrix is then reconstructed. Our observations confirm for the first time the creation of coherence between atomic systems that never interacted, a first step towards entanglement connection, a critical requirement for quantum networking and long distance quantum communications.