We compare effects of decoherence and detection inefficiency on entangledcoherent states (ECSs) and entangled photon pairs (EPPs), both of which areknown to be particularly useful for quantum information processing (QIP). Whendecoherence effects caused by photon losses are heavy, the ECSs outperform theEPPs as quantum channels for teleportation both in fidelities and in successprobabilities. On the other hand, when inefficient detectors are used, theteleportation scheme using the ECSs suffers undetected errors that result inthe degradation of fidelity, while this is not the case for the teleportationscheme using the EPPs. Our study reveals the merits and demerits of the twotypes of entangled states in realizing practical QIP under realisticconditions.
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