Atom-light entanglement is a key concept in quantum information science. Within a Rydberg atom system, the interaction-induced dephasing is often used to produce entangled states within atomic ensembles. Here, we present a theoretical model and experimental results for the temporal evolution of an initially unentangled Rydberg spin wave into an entangled Dicke state and study effects of interference between non-classical light retrieved from the atoms and a coherent probe field. These results should be useful for a range of quantum information protocols including single photon generation and atom-light entanglement preparation.
Collective qubits between atomic ground and Rydberg states can be converted, on-demand, into single photons, making them well-suited for scalable quantum network-type protocols. We demonstrate long-lived many-body Rabi oscillations and multi-particle entanglement, as well as study the dynamics of interaction-induced dephasing for collective Rydberg qubits held in a state-insensitive optical lattice trap. Both excitation blockade and spin-wave dephasing can contribute to suppression of multiple excitations, allowing for deterministic preparation of collective atomic qubits, single photons, and atom-photon entanglement for quantum information processing.
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