Experimental pre-assessing of two-mode entanglement in Gaussian state mixing

Abstract

We suggest and demonstrate a method to assess entanglement generation schemes based on mixing of Gaussian states at a beam splitter (BS). Our method is based on the fidelity criterion and represents a tool to analyze the effect of losses and noise before the BS in both symmetric and asymmetric channels with and without thermal effects. More generally, our scheme allows one to pre-assess entanglement resources and to optimize the design of BS-based schemes for the generation of continuous variable entanglement.

Continuous-variable entangled states of light carrying orbital angular momentum

“…Experimental imperfections and measurement fluctuations however always introduce small deviations from the above conditions, by introducing some degree of asymmetry. By reconstructing multiple CMs, we verified that these deviations are not systematic [6,27,40,41]. We test the degree of symmetry of our as-measured CMs by checking that the following conditions are verified:…”