Quantum Swapping of Entangled Coherent States

Abstract

In the present paper, we present a scheme to swap two non-orthogonal coherent-state which are entangled with each other. The scheme has become successful using a lossless 50:50 beam splitter and phase shifters. We took pairs of non-orthogonal coherent state entangled with each other. Then we directed one particle from one of the two pairs to (BSM) Bell-sate-measurement. This would result for the projection other two particles (which were initially independent) into an entangled state, that turns out to be the exact copy of first pair of non-orthogonal coherent state. This should be noted that this happens in all the cases except the case if photon-counting results are nil in both output modes. We have also calculated Minimum-assured-fidelity (MAF) which is defined as the least calculated fidelity for any randomly chosen initial state, for different photon-counting results in final output.