We investigate how the entanglement characteristics of a non-Gaussian entangled state are increased or decreased by a local photon subtraction operation. The non-Gaussian entangled state is generated by injecting a single-mode non-Gaussian state and a vacuum state into a 50:50 beam splitter. We consider a photon-added coherent state and an odd coherent state as a single-mode non-Gaussian state. In the regime of small amplitude, we show that the performance of quantum teleportation and the second-order Einstein-Podolsky- Rosen-type correlation can both be enhanced, whereas the degree of entanglement decreases, for the output state when a local photon subtraction operation is applied to the non-Gaussian entangled state. The counterintuitive effect is more prominent in the limit of nearly zero amplitude.
@article{arxiv.1305.6279,
title = {Increasing and decreasing entanglement characteristics for continuous variables by a local photon subtraction},
author = {Su-Yong Lee and Se-Wan Ji and Chang-Woo Lee},
journal= {arXiv preprint arXiv:1305.6279},
year = {2015}
}