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  1. 2 Open Physics

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  1. 1 2011

  2. 1 2003

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  1. 1 Bene G.

  2. 1 Shafiee A.

  3. 1 Tirandaz A.

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Comparison between decoherence time for a two-state spin ½ system with its corresponding quantum retrieval period

100%
Shafiee A., Tirandaz A.
Open Physics
|
2011
|
vol. 9
|
issue 6
1410-1420
EN
The evolution of a two-state quantum system (a spin ½ particle) in both the framework of standard quantum mechanics and under the decoherence regime is considered. The former approach on this issue is the well-known quantum flipping process of a dichotomic system subjected to a time-dependent magnetic field. In the latter approach, the Spin-Boson model is utilized to describe the interaction of system with its environment and the Born-Markov master equation is derived to obtain the decoherence time. It is possible to show that under certain conditions, one may find a potential conflict between the predictions of decoherence theory and the result observed in a typical quantum flipping experiment.
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Decoherence within a single atom

75%
Bene G.
Open Physics
|
2003
|
vol. 1
|
issue 2
332-343
EN
An “almost diagonal” reduced density matrix (in coordinate representation) is usually a result of environment induced decherence and is considered the sign of classical behavior. We show that the proton of a ground state hydrogen atom can indeed possess such a density matrix. This example demonstrates that the “almost diagonal” structure may be derived from an interaction with a low number of degrees of freedom which play the role of the environment. We also show that decoherence effects in our example can only be observed if the interaction with the measuring device is significantly faster than the interaction with the environment (the electron). In the opposite case, when the interaction with the environment is significant during the measurement process, coherence is maintained. Finally, we propose a neutron scattering experiment on cold He atoms to observe decoherence which shows up as an additional positive contribution to the differential scattering cross section. This contribution is inversely proportional to the bombarding energy.
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