Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/86918
Type: Artigo de periódico
Title: Efficient Finite-time Measurements Under Thermal Regimes
Author: Brasil C.A.
de Castro L.A.
de Jesus Napolitano R.
Abstract: Contrary to conventional quantum mechanics, which treats measurement as instantaneous, here we explore a model for finite-time measurement. The main two-level system interacts with the measurement apparatus in a Markovian way described by the Lindblad equation, and with an environment, which does not include the measuring apparatus. To analyse the environmental effects on the final density operator, we use the Redfield approach, allowing us to consider a non-Markovian noise. In the present hybrid theory, to trace out the environmental degrees of freedom, we use a previously developed analytic method based on superoperator algebra and Nakajima-Zwanzig superoperators. Here, we analyse two types of system-environment interaction, phase and amplitude damping, which allows us to conclude that, in general, a finite-time quantum measurement performed during a certain period is more efficient than an instantaneous measurement performed at the end of it, because the rate of change of the populations is attenuated by the system-measurement apparatus interaction.
Editor: Springer Verlag
Rights: fechado
Identifier DOI: 10.1140/epjp/i2014-14206-0
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84919881553&partnerID=40&md5=5bf69d55fffb5fac11b92be0666dabd7
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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