2004/01/31 by Aditi Sen, Aditi Sen De, Ujjwal Sen
Computer Science · Mathematics · Physics and Astronomy · #Computer science #Fidelity #Mathematics #Open quantum system #Phenomenon #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum cloning #Quantum dynamics #Quantum error correction #Quantum mechanics #Quantum state #Statistical physics #Telecommunications #Unitary state #quant-ph
paper · pdf · doi:10.1103/physreva.72.014304
published as Phys. Rev. A 72, 014304 (2005) · 4 pages, 2 figures, RevTeX4; v2: published version
openalex publication_date 2005/07/14 · arxiv created 2005/07/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We consider a physical system in which the description of states and measurements follow the usual quantum mechanical rules. We also assume that the dynamics is linear, but may not be fully quantum (i.e., unitary). We show that in such a physical system, certain complementary evolutions, namely, cloning and deleting operations that give a better fidelity than quantum mechanically allowed ones, in one (inaccessible) region, lead to signaling to a far-apart (accessible) region. To show such signaling, one requires certain two-party quantum correlated states shared between the two regions. Subsequent measurements are performed only in the accessible part to detect such phenomenon.