Physics – Quantum Physics
Scientific paper
2011-02-17
Eur. Phys. J. Plus (2011) 126: 91
Physics
Quantum Physics
REVISED VERSION: 19 pages
Scientific paper
10.1140/epjp/i2011-11091-y
We consider the problem of the measurement of a system occurring during a finite time interval, while environmentally-induced noise decreases the system-state coherence. We assume a Markovian measuring device and, therefore, use a Lindbladian description for the measurement dynamics. For studying the case of noise produced by a non-Markovian environment, whose definition does not include the measuring apparatus, we use the Redfield approach to the interaction between system and environment. In the present hybrid theory, to trace out the environmental degrees of freedom, we introduce an analytic method based on superoperator algebra and Nakajima-Zwanzig projectors. The resulting master equation, describing the reduced system dynamics, is illustrated in the case of a qubit under phase noise during a finite-time measurement.
Brasil Carlos Alexandre
Jesus Napolitano Reginaldo de
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