We propose a scheme to generate entanglement between a single-photon qubit in the polarization basis and a coherent state of light. The required resources are a superposition of coherent states, a polarization entangled photon pair, beam splitters, the displacement operation, and four photodetectors. Even when realistic detectors with a limited efficiency are used, an arbitrarily high fidelity can be obtained by adjusting a beam-splitter ratio and the displacement amplitude at the price of reducing the success probability. Our analysis shows that high fidelities may be obtained using on-off detectors with low efficiencies and available resource states under current technology.
@article{arxiv.1410.6823,
title = {Generation of hybrid entanglement between a single-photon polarization qubit and a coherent state},
author = {Hyukjoon Kwon and Hyunseok Jeong},
journal= {arXiv preprint arXiv:1410.6823},
year = {2015}
}