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.
Cite
@article{arxiv.1206.4442,
title = {Persistent Quantum Beats and Long-Distance Entanglement from Waveguide-Mediated Interactions},
author = {Huaixiu Zheng and Harold U. Baranger},
journal= {arXiv preprint arXiv:1206.4442},
year = {2013}
}
Comments
5 pages main text + 5 pages supplementary material; substantial rewriting of the discussion about effective qubit lifetime, loss effects, and experimental relevance