Remote tomography and entanglement swapping via von Neumann--Arthurs--Kelly interaction

Remote tomography and entanglement swapping via von Neumann–Arthurs–Kelly interaction

S. M. Roy, Abhinav Deshpande, and Nitica Sakharwade

Phys. Rev. A 89, 052107 – Published 9 May 2014

Abstract

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 $P^{'}$ 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.