2010/11/30 by Kavan Modi · 4 citations
Computer Science · Physics and Astronomy · #Dynamics (music) #Physical system #Process (computing) #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum dynamics #Quantum process #Quantum state #Quantum system #quant-ph
paper · pdf · doi:10.1038/srep00581
published as Nature Scientific Reports 2, 581 (2012) · Completely re-written for clarity of presentation. 15 pages and 2 figures
arxiv created 2012/08/08 · openalex publication_date 2012/08/15 · arxiv updated 2012/08/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A central aim of physics is to describe the dynamics of physical systems. Schrödinger's equation does this for isolated quantum systems. Describing the time evolution of a quantum system that interacts with its environment, in its most general form, has proved to be difficult because the dynamics is dependent on the state of the environment and the correlations with it. For discrete processes, such as quantum gates or chemical reactions, quantum process tomography provides the complete description of the dynamics, provided that the initial states of the system and the environment are independent of each other. However, many physical systems are correlated with the environment at the beginning of the experiment. Here, we give a prescription of quantum process tomography that yields the complete description of the dynamics of the system even when the initial correlations are present. Surprisingly, our method also gives quantitative expressions for the initial correlation.