Persistent Quantum Beats and Long-Distance Entanglement from Waveguide-Mediated Interactions

Abstract

We study photon-photon correlations and entanglement generation in a one-dimensional waveguide coupled to two qubits with an arbitrary spatial separation. We develop a novel Green function method to study vacuum-mediated qubit-qubit interactions, including both spontaneous and coherent couplings. As a result of these interactions, quantum beats appear in the second-order correlation function. We go beyond the Markovian regime and observe that such quantum beats persist much longer than the qubit life time. Using these non-Markovian processes, a high degree of long-distance entanglement can be generated, making waveguide-QED systems promising candidates for scalable quantum networking.

5 pages main text + 5 pages supplementary material; substantial rewriting of the discussion about effective qubit lifetime, loss effects, and experimental relevance

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