Coherence and Rydberg blockade of atomic ensemble qubits

M. Ebert, M. Kwon, T. G. Walker +1

We demonstrate $|W⟩$ state encoding of multi-atom ensemble qubits. Using optically trapped Rb atoms the $T_2$ coherence time is 2.6(3) ms for $\bar{N}=7.6$ atoms and scales ap…