2002/11/07 by Matteo G. A. Paris · 2 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.1088/1464-4266/4/6/313
published as Journal of Optics B Vol 4 Num 6 Pag 442 (Dec 2002) · several misprints corrected
openalex publication_date 2002/11/07 · arxiv created 2003/02/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We study the evolution of a twin beam propagating inside active media, which may be used to establish a continuous-variable entangled channel between two distant users. In particular, we analyse how entanglement is degraded during propagation, and determine a threshold value for the interaction time, above which the state becomes separable. We explicitly calculate the fidelity for coherent state teleportation and show that it is larger than one half for the whole range of parameters preserving entanglement.