Gaussian state entanglement witnessing through lossy compression
Waldemar Kłobus, Paweł Cieśliński, Lukas Knips, Paweł Kurzyński, Wiesław Laskowski · Physical Review A · 2021
We study the possibility of witnessing Gaussian entanglement between two continuous-variable systems with the help of two spatially separated qubits. Its key ingredient is a local lossy state transfer from the original systems onto local qubits. The qubits are initially in a pure product state, therefore by detecting entanglement between the qubits we witness entanglement between the two original systems.