Abstract:Qubit memory that is entangled with photonic qubit is the building block for quantum repeaters. Realizing ensemble-based repeaters requires qubit simultaneously featuring high retrieval efficiencies and long lifetimes. So far, the longest memory time at 50% retrieval efficiency for entanglement storage reaches ~40 μs. Here, by coupling cold atoms to two spatially-distinctive modes of a polarization-interferometer-based cavity, we achieve cavity-perfectly-enhanced and long-lived atom-photon entanglement. A writ… Show more
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