paper

Probabilistic Quantum Encoder for Single-Photon Qubits

arXiv:quant-ph/0312097 · doi:10.1103/PhysRevA.69.042306

Abstract

We describe an experiment in which a physical qubit represented by the polarization state of a single-photon was probabilistically encoded in the logical state of two photons. The experiment relied on linear optics, post-selection, and three-photon interference effects produced by a parametric down-conversion photon pair and a weak coherent state. An interesting consequence of the encoding operation was the ability to observe entangled three-photon Greenberger-Horne-Zeilinger states.

4 pages, 4 figures; submitted to Phys. Rev. A

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