Quantum cloning and teleportation criteria for continuous quantum variables

Frédéric Grosshans (1) , Philippe Grangier (1)

1 Laboratoire Charles Fabry de l'Institut d'Optique / Optique quantique

We discuss the criteria presently used for evaluating the efficiency of quantum teleportation schemes for continuous variables. Using an argument based upon the difference between 1-to-2 quantum cloning (quantum duplication) and 1-to-infinity cloning (classical measurement), we show that a fidelity value larger than 2/3 is required for successful quantum teleportation of coherent states. This value has not been reached experimentally so far.

Domaines: Physique Quantique [quant-ph]

Frédéric Grosshans, Philippe Grangier. Quantum cloning and teleportation criteria for continuous quantum variables. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2001, 64, pp.010301(R). ⟨10.1103/PhysRevA.64.010301⟩. ⟨hal-00509127⟩