Fidelity and information in the quantum teleportation of continuous variables

Details Fidelity and information in the quantum teleportation of continuous variables Fidelity and information in the quantum teleportation of continuous variables

2000-03-15

arxiv.org/abs/quant-ph/0003053v3

Phys. Rev. A 62, 062304 (2000)

Physics

Quantum Physics

10 pages, including one figure, minor clarifications and added reference

Scientific paper

10.1103/PhysRevA.62.062304

Ideally, quantum teleportation should transfer a quantum state without distortion and without providing any information about that state. However, quantum 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 base by enhancing low photon numbers and suppressing high photon numbers. This modification of the statistical weight corresponds to a measurement of finite resolution performed on the original quantum state. The limited fidelity of quantum teleportation is thus shown to be a direct consequence of the information obtained in the measurement.

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