Physics – Quantum Physics
Scientific paper
2007-02-22
Phys. Rev. A 75, 062311 (2007)
Physics
Quantum Physics
9 pages, 4 figures, improved explanation of cloning fidelity
Scientific paper
10.1103/PhysRevA.75.062311
The information encoded in the polarization of a single photon can be transferred to a remote location by two-channel continuous-variable quantum teleportation. However, the finite entanglement used in the teleportation causes random changes in photon number. If more than one photon appears in the output, the continuous-variable teleportation accidentally produces clones of the original input photon. In this paper, we derive the polarization statistics of the $N$-photon output components and show that they can be decomposed into an optimal cloning term and completely unpolarized noise. We find that the accidental cloning of the input photon is nearly optimal at experimentally feasible squeezing levels, indicating that the loss of polarization information is partially compensated by the availability of clones.
Hofmann Holger F.
Ide Toshiki
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