Fidelity and information in the quantum teleportation of continuous variables - art. no. 062304

Ideally, quantum teleportation should transfer a quantum state without dist ortion and without providing any information about that state. However, qua ntum teleportation of continuous electromagnetic-field variables introduces additional noise, limiting the fidelity of the quantum-state transfer. In this article, the operator describing the quantum-state transfer is derived . The transfer operator modifies the probability amplitudes of the quantum state in a shifted photon-number basis by enhancing low photon numbers and suppressing high photon numbers. This modification of the statistical weigh t corresponds to a measurement of finite resolution performed on the origin al quantum state. The limited fidelity of quantum teleportation is thus sho wn to be a direct consequence of the information obtained in the measuremen t.