Probabilistic quantum teleportation in the presence of noise

摘要

We extend the research program initiated in [Phys. Rev. A 92, 012338 (2015)],where we restricted our attention to noisy deterministic teleportationprotocols, to noisy probabilistic (conditional) protocols. Our main goal now isto study how we can increase the fidelity of the teleported state in thepresence of noise by working with probabilistic protocols. We work with severalscenarios involving the most common types of noise in realistic implementationsof quantum communication tasks and find many cases where adding more noise tothe probabilistic protocol increases considerably the fidelity of theteleported state, without decreasing the probability of a successful run of theprotocol. Also, there are cases where the entanglement of the channelconnecting Alice and Bob leading to the greatest fidelity is not maximal.Moreover, there exist cases where the optimal fidelity for the probabilisticprotocols are greater than the maximal fidelity (2/3) achievable by using onlyclassical resources, while the optimal ones for the deterministic protocolsunder the same conditions lie below this limit. This result clearly illustratesthat in some cases we can only get a truly quantum teleportation if we useprobabilistic instead of deterministic protocols.