2008/04/30 by Clara I. Osorio, S. Barreiro, Sergio Barreiro +2
Chemistry · Computer Science · Physics and Astronomy · #Chemistry #Cold Atom Physics and Bose-Einstein Condensates #Photon #Photon entanglement #Physics #Polarization (electrochemistry) #Quantum #Quantum Information and Cryptography #Quantum entanglement #Quantum mechanics #Quantum network #Quantum optics and atomic interactions #Quantum sensor #Quantum state #quant-ph
paper · pdf · doi:10.1103/physreva.78.052301
published as Phys. Rev. A 78, 052301 (2008) · 5 pages, 4 figures. Submitted to Phys. Rev. A.; one figure (Fig. 3) was added, typos and labels in figure 2 were corrected
arxiv created 2008/07/24 · openalex publication_date 2008/11/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Cold atomic ensembles can mediate the generation of entanglement between pairs of photons. Photons with specific directions of propagation are detected, and the entanglement can reside in any of the degrees of freedom that describe the whole quantum state of the photons: polarization, spatial shape, or frequency. We show that the direction of propagation of the generated photons determines the spatial quantum state of the photons and, therefore, the amount of entanglement generated. When photons generated in different directions are combined, this spatially distinguishing information can degrade the quantum purity of the polarization or frequency entanglement.