ENTANGLEMENT DIVERSION BETWEEN TWOPAIRS OF ENTANGLED COHERENT STATES:FIDELITY AND DECOHERENCE

摘要

We consider the scheme for entanglement diversion proposed by Xin-Hua with our sug-gested modification (in press, issue 1 Jan 2009) and discuss the effect of decoherenceon fidelity in such entanglement diversion. For odd photon counts, the fidelity decreaseswith increase in |α|~2 for low noise but in the case of high noise, it increases, attains amaximum 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 noisebut in the case of low noise, it increases, attains a maximum value and then decreaseswith |α|~2.