ENTANGLEMENT DIVERSION BETWEEN TWO PAIRS OF ENTANGLED COHERENT STATES: FIDELITY AND DECOHERENCE

Abstract

We consider the scheme for entanglement diversion proposed by Xin-Hua with our suggested modification (in press, issue 1 Jan 2009) and discuss the effect of decoherence on fidelity in such entanglement diversion. For odd photon counts, the fidelity decreases with increase in |α|2 for low noise but in the case of high noise, it increases, attains a maximum value and then decreases with |α|2. However, for nonzero even photon counts, the case is reversed. For this case, fidelity decreases with increase in |α|2 for high noise but in the case of low noise, it increases, attains a maximum value and then decreases with |α|2.