2003/12/10 by T. B. Pittman, B. C. Jacobs, B. C Jacobs +1 · 37 citations
Computer Science · Mathematics · Physics and Astronomy · #Computer science #Greenberger–Horne–Zeilinger state #Mathematics #Parametric statistics #Photon #Physics #Polarization (electrochemistry) #Postselection #Probabilistic logic #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum mechanics #Qubit #Spontaneous parametric down-conversion #W state #quant-ph
paper · pdf · doi:10.1103/physreva.69.042306
published in Physical Review A 69(4) (American Physical Society) · 4 pages, 4 figures; submitted to Phys. Rev. A
arxiv created 2003/12/10 · openalex publication_date 2004/04/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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, postselection, 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.