Remote tomography and entanglement swapping via von Neumann–Arthurs–Kelly interaction
Shasanka Mohan Roy, Abhinav Deshpande, Nitica Sakharwade · Physical Review A · 2014
We propose an interaction-based method for remote tomography and entanglement swapping. Alice arranges a von Neumann-Arthurs-Kelly interaction between a system particle $P$ and two apparatus particles ${A}_{1},{A}_{2}$, and then transports the latter to Bob. Bob can reconstruct the unknown initial state of particle $P$ not received by him by quadrature measurements on ${A}_{1},{A}_{2}$. Further, if another particle ${P}^{\ensuremath{'}}$ in Alice's hands is EPR entangled with $P$, it will be EPR entangled with the distant pair ${A}_{1},{A}_{2}$. This method will be contrasted with the usual teleportation protocols.