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Type: Artigo de periódico
Title: How Much Time Does a Measurement Take?
Author: Brasil, CA
de Castro, LA
Napolitano, RDJ
Abstract: We consider the problem of measurement using the Lindblad equation, which allows the introduction of time in the interaction between the measured system and the measurement apparatus. We use analytic results, valid for weak system-environment coupling, obtained for a two-level system in contact with a measurer (Markovian interaction) and a thermal bath (non-Markovian interaction), where the measured observable may or may not commute with the system-environment interaction. Analysing the behavior of the coherence, which tends to a value asymptotically close to zero, we obtain an expression for the time of measurement which depends only on the system-measurer coupling, and which does not depend on whether the observable commutes with the system-bath interaction. The behavior of the coherences in the case of strong system-environment coupling, found numerically, indicates that an increase in this coupling decreases the measurement time, thus allowing our expression to be considered the upper limit for the duration of the process.
Subject: Quantum measurement theory
Lindblad equation
Finite-time measurement
Open quantum system
Country: EUA
Editor: Springer
Citation: Foundations Of Physics. Springer, v. 43, n. 5, n. 642, n. 655, 2013.
Rights: fechado
Identifier DOI: 10.1007/s10701-013-9707-7
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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