Physics – Quantum Physics
Scientific paper
2011-06-22
Phys. Rev. A 84, 022112 (2011)
Physics
Quantum Physics
REVISED VERSION: 37 pages, 3 figures
Scientific paper
10.1103/PhysRevA.84.022112
We show that measurements of finite duration performed on an open two-state system can protect the initial state from a phase-noisy environment, provided the measured observable does not commute with the perturbing interaction. When the measured observable commutes with the environmental interaction, the finite-duration measurement accelerates the rate of decoherence induced by the phase noise. For the description of the measurement of an observable that is incompatible with the interaction between system and environment, we have found an approximate analytical expression, valid at zero temperature and weak coupling with the measuring device. We have tested the validity of the analytical predictions against an exact numerical approach, based on the superoperator-splitting method, that confirms the protection of the initial state of the system. When the coupling between the system and the measuring apparatus increases beyond the range of validity of the analytical approximation, the initial state is still protected by the finite-time measurement, according with the exact numerical calculations.
Brasil Carlos Alexandre
de Castro Leonardo Andreta
Jesus Napolitano Reginaldo de
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