2008/05/31 by Sean D. Huver, Christoph F. Wildfeuer, Jonathan P. Dowling · 4 citations
Computer Science · Physics and Astronomy · #Neural Networks and Reservoir Computing #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph
paper · pdf · doi:10.1103/physreva.78.063828
published as Phys. Rev. A 78, 063828 (2008) · 4 pages, 5 figures, extended introduction and minor revisions
arxiv created 2008/08/15 · openalex publication_date 2008/12/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose a class of path-entangled photon Fock states for robust quantum optical metrology, imaging, and sensing in the presence of loss. We model propagation loss with beam splitters and derive a reduced density-matrix formalism from which we examine how photon loss affects coherence. It is shown that particular entangled number states, which contain a special superposition of photons in both arms of a Mach-Zehnder interferometer, are resilient to environmental decoherence. We demonstrate an order of magnitude greater visibility with loss than possible with path-entangled \ensuremath|N,0⟩+\ensuremath|0,N⟩ states. We also show that the effectiveness of a detection scheme is related to super-resolution visibility.